Realized gain and unrealized gain (loss) on foreign exchange – 2024 Notes. In June 2019, we completed an offering of our €135.0 million principal amount of 2024 Notes. In June 2020 our €215.0 million 2024 Notes were issued at a Euro to USD rate of $1.112. We received proceeds in USD on the 2024 Notes on June 9, 2020 at a Euro to USD rate of $1.133 resulting in a realized gain on foreign exchange of $2.5 million. Our 2024 Notes were issued in Euros and are reported in our reporting currency – US Dollars. As of June 30, 2021 our 2024 Notes were valued at $415.8 million. Our unrealized (loss) gain on foreign exchange on our 2024 Notes from converting our 2024 Notes into USD was $13.6 million for the six months ended June 30, 2021 and $(0.5) million for the six months ended June 30, 2020. We do not enter into hedges for our foreign currency obligations.
Income Tax Provision. Our income tax provision was $7.8 million for the six months ended June 30, 2021 and $6.3 million for the six months ended June 30, 2020. The increase in our income tax provision is primarily related to an increase in certain non-deductible expenses.
Buildings On-net. As of June 30, 2021 and 2020, we had a total of 2,975 and 2,854 on-net buildings connected to our network, respectively. The increase in our on-net buildings was a result of our disciplined network expansion program. We anticipate adding a similar number of buildings to our network for the next several years.
Liquidity and Capital Resources
In assessing our liquidity, management reviews and analyzes our current cash balances, accounts receivable, accounts payable, accrued liabilities, capital expenditure commitments, and required finance lease and debt payments and other obligations.
Over the next several years we have significant contractual and anticipated cash outlays including our indicative dividend payments on our common stock, our maturing debt obligations, interest payments on our debt obligations and our projected capital expenditure requirements in order to help execute our business plan. Based upon our historical growth rate of our dividend, we expect that we would have to provide approximately $330 million in order to meet our expected quarterly dividend payments over the next two years. In March 2021, we redeemed and extinguished $115.9 million of our 2022 Notes. In April, 2021 we redeemed $45.0 million of our 2022 Notes and in May 2021 we redeemed the remaining $284.1 million of our 2022 Notes with the proceeds from our issuance of $500.0 million of our 2026 Notes. Our 2022 Notes accrued interest at 5.375% and our 2026 Notes accrue interest at 3.50%. Our $500.0 million of 2026 Notes mature in May 2026 and include annual interest payments of $17.5 million until maturity.
Our €350 million of 2024 Notes mature in June 2024 and include annual interest payments of €15.3 million until maturity. Our 2024 Notes are denominated in Euros and expose us to potentially unfavorable adverse movements in foreign currency rate changes. Our overseas operations provides us access to Euros, however these amounts may be insufficient to fund our obligations under our 2024 Notes. Additionally, we have not entered into forward exchange contracts related to our foreign currency exposure.
We may need to or elect to refinance all or a portion of our indebtedness at or before maturity and we cannot provide assurances that we will be able to refinance any such indebtedness on commercially reasonable terms or at all. In addition, we may elect to secure additional capital in the future, at acceptable terms, to improve our liquidity or fund acquisitions or for general corporate purposes. In addition, in an effort to reduce future cash interest payments as well as future amounts due at maturity or to extend debt maturities, we may, from time to time, issue new debt, enter into debt for debt, or cash transactions to purchase our outstanding debt securities in the open market or through privately negotiated transactions. We will evaluate any such transactions in light of the existing market conditions. The amounts involved in any such transaction, individually or in the aggregate, may be material.
We or our affiliates may, at any time and from time to time, seek to retire or purchase our outstanding debt through cash purchases and/or exchanges for equity or debt, in open-market purchases, privately negotiated transactions or otherwise. Such repurchases or exchanges, if any, will be upon such terms and at such prices as we may determine, and will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. The amounts involved may be material.
Any future acquisitions or other significant unplanned costs or cash requirements in excess of amounts we currently hold may require that we raise additional funds through the issuance of debt or equity. We cannot assure you that such financing will be available on terms acceptable to us or our stockholders, or at all. Insufficient funds may require us to delay or scale back the number of buildings and markets that we add to our network, reduce our planned increase in our sales and marketing efforts, or require us to otherwise alter our business plan or take other actions that could have a material adverse effect on our business, results of operations and financial condition. If issuing equity securities raises additional funds, substantial dilution to existing stockholders may result.