EXHIBIT 11 — COMPUTATION OF EARNINGS PER SHARE

(In thousands of dollars, except per share data)	Six Months Ended June 30,				Three Months Ended June 30,
	2005		2004		2005		2004
Numerator:
Net income	$	268,614	$	370,230	$	220,732	$	253,770
Effect of dilutive securities — none
Numerator for net income per common share — diluted	$	268,614	$	370,230	$	220,732	$	253,770
Denominator:
Weighted average common shares		551,673		613,517		543,904		610,478
Effect of dilutive securities:
Stock options and common stock warrants		1,307		2,775		1,186		2,482
Denominator for net income per common share — diluted		552,980		616,292		545,090		612,960
Net income (loss) per common share:
Basic	$	.49	$	.60	$	.41	$	.42
Diluted	$	.49	$	.60	$	.40	$	.41