Exhibit 12a STATEMENT SETTING FORTH COMPUTATIONS OF RATIOS OF EARNINGS TO FIXED CHARGES (Dollars in Thousands) 12 Months Ending Year Ended December 31, September 30, 1999 1998 1997 1996 1995 1994 - -------------------------------- --------- --------- --------- --------- --------- --------- EARNINGS AVAILABLE FOR FIXED CHARGES Pre-tax income: Income from continuing operations per statement of income $ 187,825 $ 169,612 $ 125,698 $ 167,351 $ 128,382 $ 79,312 Federal income taxes 111,220 107,904 47,725 107,747 91,519 74,816 Federal income taxes charged to other income - net 6,903 1,807 11,876 (1,608) (12,068) 22,687 Capitalized interest (4,677) (1,782) (360) (600) (660) (400) Undistributed (earnings) or losses of less-than- fifty-percent-owned entities -- -- (608) 460 8,325 743 - -------------------------------- --------- --------- --------- --------- --------- --------- Total $ 301,271 $ 277,541 $ 184,331 $ 273,350 $ 215,498 $ 177,158 - -------------------------------- --------- --------- --------- --------- --------- --------- Fixed charges: Interest expense $ 155,108 $ 146,140 $ 123,439 $ 122,635 $ 131,346 $ 126,555 Other interest 4,677 1,782 360 600 660 400 Portion of rentals representative of the interest factor 4,214 2,878 3,143 4,187 5,150 5,555 - -------------------------------- --------- --------- --------- --------- --------- --------- Total $ 163,999 $ 150,800 $ 126,942 $ 127,422 $ 137,156 $ 132,510 - -------------------------------- --------- --------- --------- --------- --------- --------- Earnings available for combined fixed charges $ 465,270 $ 428,341 $ 311,273 $ 400,772 $ 352,654 $ 309,668 RATIO OF EARNINGS TO FIXED CHARGES 2.84x 2.84x 2.45x 3.15x 2.57x 2.34x 1 STATEMENT SETTING FORTH COMPUTATIONS OF RATIOS OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS (Dollars in Thousands) 12 Months Ending Year Ended December 31, September 30, 1999 1998 1997 1996 1995 1994 - -------------------------------- --------- --------- --------- --------- --------- --------- EARNINGS AVAILABLE FOR COMBINED FIXED CHARGES AND PREFERRED DIVIDEND REQUIREMENTS Pretax income: Income from continuing operations per statement of income $ 187,825 $ 169,612 $ 125,698 $ 167,351 $ 128,382 $ 79,312 Federal income taxes 111,220 107,904 47,725 107,747 91,519 74,816 Federal income taxes charged to other income - net 6,903 1,807 11,876 (1,608) (12,068) 22,687 Subtotal 305,948 279,323 185,299 273,490 207,833 176,815 Capitalized interest (4,677) (1,782) (360) (600) (660) (400) Undistributed (earnings) or losses of less-than-fifty- percent-owned entities -- -- (608) 460 8,325 743 - -------------------------------------------- --------- --------- --------- --------- --------- Total $ 301,271 $ 277,541 $ 184,331 $ 273,350 $ 215,498 $ 177,158 - -------------------------------------------- --------- --------- --------- --------- --------- Fixed charges: Interest expense $ 155,108 $ 146,140 $ 123,439 $ 122,635 $ 131,346 $ 126,555 Other interest 4,677 1,782 360 600 660 400 Portion of rentals representative of the interest factor 4,214 2,878 3,143 4,187 5,150 5,555 - -------------------------------------------- --------- --------- --------- --------- --------- Total $ 163,999 $ 150,800 $ 126,942 $ 127,422 $ 137,156 $ 132,510 - -------------------------------------------- --------- --------- --------- --------- --------- Earnings available for combined fixed charges and preferred dividend requirements $ 465,270 $ 428,341 $ 311,273 $ 400,772 $ 352,654 $ 309,668 DIVIDEND REQUIREMENT: Fixed charges above $ 163,999 $ 150,800 $ 126,942 $ 127,422 $ 137,156 $ 132,510 Preferred dividend requirements below 19,395 21,414 26,250 36,249 36,674 45,441 - -------------------------------------------- --------- --------- --------- --------- --------- Total $ 183,394 $ 172,214 $ 153,192 $ 163,671 $ 173,830 $ 177,951 - -------------------------------------------- --------- --------- --------- --------- --------- 2 12 Months Ending Year Ended December 31, September 30, 1999 1998 1997 1996 1995 1994 - -------------------------------- --------- --------- --------- --------- --------- --------- RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDEND REQUIREMENTS 2.54 2.49 2.03 2.45 2.03 1.74 COMPUTATION OF PREFERRED DIVIDEND REQUIREMENTS: (a) Pre-tax income $305,948 $ 279,323 $ 185,299 $ 273,490 $ 207,833 $ 176,815 (b) Income from continuing operations $187,825 $ 169,612 $ 125,698 $ 167,351 $ 128,382 $ 79,312 (c) Ratio of (a) to (b) 1.6289 1.6468 1.4742 1.6342 1.6189 2.2294 (d) Preferred dividends $ 11,907 $ 13,003 $ 17,806 $ 22,181 $ 22,654 $ 20,383 Preferred dividend requirements [(d) multiplied by (c)] $ 19,395 $ 21,414 $ 26,250 $ 36,249 $ 36,674 $ 45,441 3