EXHIBIT 12 Statement Regarding Computation of Ratios The following formulas were used to calculate the ratios in the Selected Financial Data for the years ended December 31, 1998, 1997, 1996, 1995 and 1994, included in this report as Exhibit 13. (Calculation) Net Income/Weighted average shares of common stock outstanding for the period = Earnings Per Share. December 31, --------------------------------------------------------------------------- 1998 1997 1996 1995 1994 ----------- ----------- ----------- ----------- ----------- Net income $ 2,915,961 $ 3,005,462 $ 2,746,981 $ 2,626,728 $ 2,216,437 Weighted Average Shares Outstanding 666,779 665,215 669,465 675,000 675,000 Per Share Amount $4.37 $4.52 $4.10 $3.89 $3.28 Cash dividends/Average Shares Outstanding = Cash dividends declared Per share December 31, --------------------------------------------------------------------------- 1998 1997 1996 1995 1994 ----------- ----------- ----------- ----------- ----------- Cash dividends $ 718,882 $ 611,412 $ 507,792 $ 438,750 $ 398,250 Average shares outstanding 684,650 664,578 668,147 675,000 675,000 Per Share Amount $1.05 $.92 $.76 $.65 $.59 Stockholders' Equity/Shares Outstanding at period end = Book Value per share December 31, --------------------------------------------------------------------------- 1998 1997 1996 1995 1994 ----------- ----------- ----------- ----------- ----------- Shareholders' Equity $27,437,211 $22,157,609 $19,933,740 $18,265,569 $16,003,697 Shares outstanding 705,331 661,900 667,500 675,000 675,000 Per Share Amount $38.90 $33.48 $29.86 $27.06 $23.71 Net Income/Average Assets = Return on Average Assets (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Net Income $ 2,916 $ 3,005 $ 2,747 $ 2,627 $ 2,216 Average Assets $208,565 $193,923 $175,807 $158,199 $145,894 Return on Average Assets 1.40% 1.55% 1.56% 1.66% 1.52% Net Income/Average Shareholders' equity = Return on Average Equity (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Net Income $ 2,916 $ 3,005 $ 2,747 $ 2,627 $ 2,216 Average Shareholders' Equity $ 23,615 $ 21,067 $ 18,858 $ 17,286 $ 15,253 Return on Average Equity 12.35% 14.26% 14.57% 15.20% 14.53% Cash dividends per share/ Net income per share = Dividends Payout Ratio (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Cash dividends per share $ 1.05 $ .92 $ .76 $ .65 $ .59 Net income per share $ 4.37 $ 4.52 $ 4.10 $ 3.89 $ 3.28 Dividend Payout Ratio 24.03% 20.35% 18.54% 16.71% 17.99% Average Equity/Average Assets = Average Equity To Average Assets (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Average Shareholders' Equity $ 23,615 $ 21,067 $ 18,858 $ 17,286 $ 15,253 Average Assets $208,565 $193,923 $175,807 $158,199 $145,894 Average Equity to Average Assets 11.32% 10.86% 10.73% 10.93% 10.46% Loans/Total deposits = Loan to Deposit Ratio (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Total loans $137,891 $122,034 $116,259 $107,255 $103,238 Total deposits $192,079 $163,809 $157,399 $150,413 $132,112 Loan to Deposit Ratio 71.79% 74.50% 73.86% 71.31% 78.14% Allowance for Loan Loss/ Total Loan = Allowance To Total Loan Ratio (In Thousands) December 31, ---------------------------------------------------- 1998 1997 1996 1995 1994 -------- -------- -------- -------- -------- Allowance $ 1,851 $ 1,745 $ 1,653 $ 1,545 $ 1,378 Total loans $137,891 $122,034 $116,259 $107,255 $103,238 Allowance to total Loan ratio 1.34% 1.43% 1.42% 1.44% 1.34%