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, 1999, 1998, 1997, 1996 and 1995, 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, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Net income $ 3,018,327 $ 2,915,961 $ 3,005,462 $ 2,746,981 $ 2,626,728 Weighted Average Shares Outstanding 705,331 666,779 665,215 669,465 675,000 Per Share Amount $ 4.28 $ 4.37 $ 4.52 $4.10 $ 3.89 Cash dividends/Average Shares Outstanding = Cash dividends declared Per share December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Cash dividends $ 881,664 $ 718,882 $ 611,412 $ 507,792 $ 438,750 Average shares outstanding 705,331 684,650 664,578 668,147 675,000 Per Share Amount $ 1.25 $ 1.05 $ .92 $ .76 $ .65 Shareholders' Equity/Shares Outstanding at period end = Book Value per share December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Shareholders' Equity $28,916,718 $27,437,211 $22,157,609 $19,933,740 $18,265,569 Shares outstanding 705,331 705,331 661,900 667,500 675,000 Per Share Amount $41.00 $38.90 $33.48 $29.86 $27.06 Net Income/Average Assets = Return on Average Assets (In Thousands) December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Net Income $ 3,018 $ 2,916 $ 3,005 $ 2,747 $ 2,627 Average Assets $234,279 $208,565 $193,923 $175,807 $158,199 Return on Average Assets 1.29% 1.40% 1.55% 1.56% 1.66% Net Income/Average Shareholders' equity = Return on Average Equity (In Thousands) December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Net Income $ 3,018 $ 2,916 $ 3,005 $ 2,747 $ 2,627 Average Shareholders' Equity $ 28,238 $ 23,615 $ 21,067 $ 18,858 $ 17,286 Return on Average Equity 10.69% 12.35% 14.26% 14.57% 15.20% Cash dividends per share/ Net income per share = Dividends Payout Ratio December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Cash dividends per share $ 1.25 $ 1.05 $ .92 $ .76 $ .65 Net income per share $ 4.28 $ 4.37 $ 4.52 $ 4.10 $ 3.89 Dividend Payout Ratio 29.21% 24.03% 20.35% 18.54% 16.71% Average Equity/Average Assets = Average Equity To Average Assets (In Thousands) December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Average Shareholders' Equity $ 28,238 $ 23,615 $ 21,067 $ 18,858 $ 17,286 Average Assets $234,279 $208,565 $193,923 $175,807 $158,199 Average Equity to Average Assets 12.05% 11.32% 10.86% 10.73% 10.93% Loans/Total deposits = Loan to Deposit Ratio (In Thousands) December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Total loans $143,777 $137,891 $122,034 $116,259 $107,255 Total deposits $201,738 $192,079 $163,809 $157,399 $150,413 Loan to Deposit Ratio 71.27% 71.79% 74.50% 73.86% 71.31% Allowance for Loan Loss/ Total Loan = Allowance To Total Loan Ratio (In Thousands) December 31, --------------------------------------------------------------------------- 1999 1998 1997 1996 1995 ----------- ----------- ----------- ----------- ----------- Allowance $ 1,888 $ 1,851 $ 1,745 $ 1,653 $ 1,545 Total loans $143,777 $137,891 $122,034 $116,259 $107,255 Allowance to total Loan ratio 1.31% 1.34% 1.43% 1.42% 1.44%