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, 2002, 2001, 2000, 1999 and 1998, 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, ---------------------------------------------------------------- 2002 2001 2000 1999 1998 ----------- ----------- ---------- ---------- ---------- Net income $ 3,217,544 $ 2,944,565 $ 3,282,921 $ 3,018,327 $ 2,915,961 Weighted Average Shares Outstanding 687,216 696,674 704,498 705,331 666,779 Per Share Amount $ 4.68 $ 4.23 $ 4.66 $ 4.28 $ 4.37 Cash dividends/Average Shares Outstanding = Cash dividends declared Per share December 31, -------------------------------------------------------------- 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Cash dividends $1,200,309 $1,113,627 $1,020,487 $ 881,664 $ 718,882 Average shares outstanding 687,216 696,017 703,784 705,331 684,650 Per Share Amount $ 1.75 $ 1.60 $ 1.45 $ 1.25 $ 1.05 Shareholders' Equity/Shares Outstanding at period end = Book Value per share December 31, ------------------------------------------------------------------- 2002 2001 2000 1999 1998 ----------- ----------- ----------- ----------- ----------- Shareholders' Equity $34,203,659 $33,037,452 $31,741,165 $28,916,718 $27,437,211 Shares outstanding 686,739 693,287 702,548 705,331 705,331 Per Share Amount $ 49.81 $ 47.65 $ 45.18 $ 41.00 $ 38.90 Net Income/Average Assets = Return on Average Assets (In Thousands) December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Net Income $ 3,218 $ 2,945 $ 3,283 $ 3,018 $ 2,916 Average Assets $ 280,598 $ 268,265 $ 250,577 $ 234,279 $ 208,565 Return on Average Assets 1.15% 1.10% 1.31% 1.29% 1.40% Net Income/Average Shareholders' equity = Return on Average Equity (In Thousands) December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Net Income $ 3,218 $ 2,945 $ 3,283 $ 3,018 $ 2,916 Average Shareholders' Equity $ 31,868 $ 31,534 $ 29,893 $ 28,238 $ 23,615 Return on Average Equity 10.10% 9.34% 10.98% 10.69% 12.35% Cash dividends per share/ Net income per share = Dividends Payout Ratio December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Cash dividends per share $ 1.75 $ 1.60 $ 1.45 $ 1.25 $ 1.05 Net income per share $ 4.68 $ 4.23 $ 4.66 $ 4.28 $ 4.37 Dividend Payout Ratio 37.31% 37.83% 31.12% 29.21% 24.03% Average Equity/Average Assets = Average Equity To Average Assets (In thousands) December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Average Shareholders' Equity $ 31,868 $ 31,534 $ 29,893 $ 28,238 $ 23,615 Average Assets $ 280,598 $ 268,265 $ 250,577 $ 234,279 $ 208,565 Average Equity to Average Assets 11.36% 11.75% 11.93% 12.05% 11.32% Loans/Total deposits = Loan to Deposit Ratio (In thousands) December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Total loans $ 175,157 $ 152,158 $ 151,800 $ 143,777 $ 137,891 Total deposits $ 239,039 $ 237,971 $ 219,168 $ 201,738 $ 192,079 Loan to Deposit Ratio 73.28% 63.94% 69.26% 71.27% 71.79% Allowance for Loan Loss/ Total Loan = Allowance To Total Loan Ratio (In thousands) December 31, ------------------------------------------------------------------ 2002 2001 2000 1999 1998 ---------- ---------- ---------- ---------- ---------- Allowance $ 2,326 $ 2,261 $ 2,359 $ 1,888 $ 1,851 Total loans $ 175,157 $ 152,158 $ 151,800 $ 143,777 $ 137,891 Allowance to total Loan ratio 1.33% 1.49% 1.55% 1.31% 1.34%