1 EXHIBIT 12 STATEMENT OF COMPUTATION OF OTHER RATIOS (Dollars in thousands, except per share data) For the year ended December 31: 1997 1996 1995 1994 ---- ---- ---- ---- Net income $ 180,304 $ 158,701 $ 141,814 $ 137,084 Less: preferred stock dividends -- -- -- -- --------------- -------------- --------------- --------- Net income available to common shareholders $ 180,304 $ 158,701 $ 141,814 $ 137,084 Average common equity $ 1,037,958 $ 1,013,370 $ 972,665 $ 887,541 Average total equity 1,027,100 1,000,841 960,858 884,415 Average assets 13,298,246 12,251,860 11,674,214 10,761,022 Diluted net income per common share* $ 1.88 $ 1.61 $ 1.41 $ 1.37 Dividends per common share* $ 0.674 $ 0.604 $ 0.554 $ 0.509 Ratios: Return on average common equity 17.37% 15.66% 14.58% 15.45% (net income available to common shareholders divided by average common equity) Return on average total equity 17.55% 15.86% 14.76% 15.50% (net income divided by average total equity) Return on average assets 1.36% 1.30% 1.21% 1.27% (net income divided by average assets) Average total equity to average assets 7.72% 8.17% 8.23% 8.22% Dividend payout ratio 35.9% 37.5% 39.2% 37.2% (dividends per common share divided by net income per common share) (Dollars in thousands, except per share data) For the year ended December 31: 1993 ---- Net income $ 131,324 Less: preferred stock dividends -- --------------- Net income available to common shareholders $ 131,324 Average common equity $ 802,016 Average total equity 802,016 Average assets 9,718,875 Diluted net income per common share* $ 1.32 Dividends per common share* $ 0.461 Ratios: Return on average common equity 16.37% (net income available to common shareholders divided by average common equity) Return on average total equity 16.37% (net income divided by average total equity) Return on average assets 1.35% (net income divided by average assets) Average total equity to average assets 8.25% Dividend payout ratio 34.9% (dividends per common share divided by net income per common share) ___________________________________________ * Per share amounts are shown adjusted for a 5% stock dividend paid on August 15, 1995, July 25, 1996, and July 28, 1997, and a 3-for-2 stock split paid September 1992, and a 2-for-1 stock split paid December 15, 1997.