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, 2001, 2000, 1999, 1998 and 1997, 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, -------------------------------------------------------------- 2001 2000 1999 1998 1997 ---------- ---------- ---------- ---------- ---------- Net income $2,944,565 $3,282,921 $3,018,327 $2,915,961 $3,005,462 Weighted Average Shares Outstanding 696,674 704,498 705,331 666,779 665,215 Per Share Amount $ 4.23 $ 4.66 $ 4.28 $ 4.37 $ 4.52 Cash dividends/Average Shares Outstanding = Cash dividends declared Per share December 31, -------------------------------------------------------- 2001 2000 1999 1998 1997 ---------- ---------- -------- -------- -------- Cash dividends $1,113,627 $1,020,487 $881,664 $718,882 $611,412 Average shares outstanding 696,017 703,784 705,331 684,650 664,578 Per Share Amount $ 1.60 $ 1.45 $ 1.25 $ 1.05 $ .92 Shareholders' Equity/Shares Outstanding at period end = Book Value per share December 31, ------------------------------------------------------------------- 2001 2000 1999 1998 1997 ----------- ----------- ----------- ----------- ----------- Shareholders' Equity $33,037,452 $31,741,165 $28,916,718 $27,437,211 $22,157,609 Shares outstanding 693,287 702,548 705,331 705,331 661,900 Per Share Amount $ 47.65 $ 45.18 $ 41.00 $ 38.90 $ 33.48 Net Income/Average Assets = Return on Average Assets (In Thousands) December 31, ---------------------------------------------------- 2001 2000 1999 1998 1997 -------- -------- -------- -------- -------- Net Income $ 2,945 $ 3,283 $ 3,018 $ 2,916 $ 3,005 Average Assets $268,265 $250,577 $234,279 $208,565 $193,923 Return on Average Assets 1.10% 1.31% 1.29% 1.40% 1.55% Net Income/Average Shareholders' equity = Return on Average Equity (In Thousands) December 31, ----------------------------------------------- 2001 2000 1999 1998 1997 ------- ------- ------- ------- ------- Net Income $ 2,945 $ 3,283 $ 3,018 $ 2,916 $ 3,005 Average Shareholders' Equity $31,534 $29,893 $28,238 $23,615 $21,067 Return on Average Equity 9.34% 10.98% 10.69% 12.35% 14.26% Cash dividends per share/ Net income per share = Dividends Payout Ratio December 31, ------------------------------------------ 2001 2000 1999 1998 1997 ------ ------ ------ ------ ------ Cash dividends per share $ 1.60 $ 1.45 $ 1.25 $ 1.05 $ .92 Net income per share $ 4.23 $ 4.66 $ 4.28 $ 4.37 $ 4.52 Dividend Payout Ratio 37.83% 31.12% 29.21% 24.03% 20.35% Average Equity/Average Assets = Average Equity To Average Assets (In thousands) December 31, ---------------------------------------------------- 2001 2000 1999 1998 1997 -------- -------- -------- -------- -------- Average Shareholders' Equity $ 31,534 $ 29,893 $ 28,238 $ 23,615 $ 21,067 Average Assets $268,265 $250,577 $234,279 $208,565 $193,923 Average Equity to Average Assets 11.75% 11.93% 12.05% 11.32% 10.86% Loans/Total deposits = Loan to Deposit Ratio (In thousands) December 31, ---------------------------------------------------- 2001 2000 1999 1998 1997 -------- -------- -------- -------- -------- Total loans $152,158 $151,800 $143,777 $137,891 $122,034 Total deposits $237,971 $219,168 $201,738 $192,079 $163,809 Loan to Deposit Ratio 63.94% 69.26% 71.27% 71.79% 74.50% Allowance for Loan Loss/ Total Loan = Allowance To Total Loan Ratio (In thousands) December 31, ---------------------------------------------------- 2001 2000 1999 1998 1997 -------- -------- -------- -------- -------- Allowance $ 2,261 $ 2,359 $ 1,888 $ 1,851 $ 1,745 Total loans $152,158 $151,800 $143,777 $137,891 $122,034 Allowance to total Loan ratio 1.49% 1.55% 1.31% 1.34% 1.43%