<Page>
GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
NUMBER ON SUBSTITUTE FORM W-9
GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER.--Social Security numbers have nine digits separated by two hyphens: E.G.,
000-00-0000. Employer identification numbers have nine digits separated by only
one hyphen: E.G., 00-0000000. The table below will help determine the number to
give the payer.
<Table>
<Caption>
--------------------------------------------------
GIVE THE
FOR THIS TYPE OF SOCIAL SECURITY
ACCOUNT: NUMBER OF--
--------------------------------------------------
1. An individual's The individual
account
2. Two or more The actual owner of the
individuals (joint account or, if combined
account) funds, any one of the
individuals(1)
3. Husband and wife The actual owner of the
(joint account) account or, if joint
funds, either person(1)
4. Custodian account of The minor(2)
a minor (Uniform Gift
to Minors Act)
5. Adult and minor The adult or, if the
(joint account) minor is the only
contributor, the
minor(1)
6. Account in the name The ward, minor, or
of guardian or incompetent person(3)
committee for a
designated ward,
minor, or incompetent
person
7. a. The usual The grantor-trustee(1)
revocable savings
trust account
(grantor is also
trustee)
b. So-called trust The actual owner(1)
account that is not a
legal or valid trust
under State law
8. Sole proprietorship The owner(4)
account
<Caption>
--------------------------------------------------
GIVE THE EMPLOYER
IDENTIFICATION
FOR THIS TYPE OF ACCOUNT: NUMBER OF--
--------------------------------------------------
9. Sole proprietorship The owner(4)
account
10. A valid trust, The legal entity (Do not
estate, or pension furnish the identifying
trust number of the personal
representative or
trustee unless the legal
entity itself is not
designated in the
account title.)(5)
11. Corporate account The corporation
12. Religious, The organization
charitable, or
educational
organization account
13. Partnership account The partnership
held in the name of
the business
14. Association, club, The organization
or other tax-exempt
organization
15. A broker or The broker or nominee
registered nominee
16. Account with the The public entity
Department of
Agriculture in the
name of a public
entity (such as a
State or local
government, school
district, or prison)
that receives
agricultural program
payments
</Table>
--------------------------------------------------------------------------------
(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Circle the ward's, minor's or incompetent person's name and furnish such
person's social security number.
(4) Show the name of the owner but you may also enter your business or "doing
business as" name. You may use either your social security number or your
employer identification number (if you have one).
(5) List first and circle the name of the legal trust, estate, or pension trust.
NOTE: If no name is circled when there is more than one name, the number will
be considered to be that of the first name listed.
<Page>
GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
NUMBER ON SUBSTITUTE FORM W-9
OBTAINING A NUMBER
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card, or Form
SS-4, Application for Employer Identification Number, at the local office of the
Social Security Administration or the Internal Revenue Service ("IRS") and apply
for a number.
PAYEES EXEMPT FROM BACKUP WITHHOLDING
Payees specifically exempted from backup withholding on ALL payments include
the following:
- A corporation.
- A financial institution.
- An organization exempt from tax under section 501(a), or an individual
retirement plan.
- The United States or any agency or instrumentality thereof.
- A State, the District of Columbia, a possession of the United States, or
any subdivision or instrumentality thereof.
- A foreign government, a political subdivision of a foreign government, or
any agency or instrumentality thereof.
- An international organization or any agency, or instrumentality thereof.
- A registered dealer in securities or commodities registered in the United
States or a possession of the United States.
- A real estate investment trust.
- A common trust fund operated by a bank under section 584(a).
- An exempt charitable remainder trust, or a non-exempt trust described in
section 4947(a)(1).
- An entity registered at all times under the investment Company Act of
1940.
- A foreign central bank of issue.
Payments of dividends and patronage dividends not generally subject to
backup withholding include the following:
- Payments to nonresident aliens subject to withholding under section 1441.
- Payments to partnerships not engaged in a trade or business in the United
States and which have at least one nonresident alien partner.
- Payments of patronage dividends where the amount received is not paid in
money.
- Payments made by certain foreign organizations.
- Payments made to a nominee.
Payments of interest not generally subject to backup withholding include the
following:
- Payments of interest on obligations issued by individuals. Note: You may
be subject to backup withholding if this interest is $600 or more and is
paid in the course of the payer's trade or business and you have not
provided your correct taxpayer identification number to the payer.
- Payments of tax-exempt interest (including exempt-interest dividends under
section 852).
- Payment described in section 6049(b)(5) to nonresident aliens.
- Payments on tax-free covenant bonds under section 1451.
- Payments made by certain foreign organizations.
- Payments made to a nominee.
Exempt payees described above should file Form W-9 to avoid possible
erroneous backup withholding. FILE THIS FORM WITH THE PAYER, FURNISH YOUR
TAXPAYER IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND
RETURN IT TO THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE
DIVIDENDS, ALSO SIGN AND DATE THE FORM.
Certain payments other than interest dividends, and patronage dividends,
that are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under sections 6041, 6041A(a),
6045, and 6050A.
PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to IRS. IRS uses the numbers for identification
purposes. Payers must be given the numbers whether or not recipients are
required to file tax returns. Beginning January 1, 1984, payers must generally
withhold 31% of taxable interest, dividend, and certain other payments to a
payee who does not furnish a taxpayer identification number to a payer. Certain
penalties may also apply.
PENALTIES
(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.--If you fail
to furnish your taxpayer identification number to a payer, you are subject
to a penalty of $50 for each such failure unless your failure is due to
reasonable cause and not to willful neglect.
(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.--If you
make a false statement with no reasonable basis which results in no
imposition of backup withholding, you are subject to a penalty of $500.
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION.--Falsifying certifications or
affirmations may subject you to criminal penalties including fines and/or
imprisonment.
FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL
REVENUE SERVICE.