Summary of Quarterly Results (Unaudited) (Thousands of dollars, except share data) Quarter Ended ------------------------------------------- March June September December 31 30 30 31 ------------------------------------------- 2001 - ---- Net sales .......................................................................... $239,156 $239,386 $231,824 $207,740 Gross profit ....................................................................... 49,704 49,590 43,003 36,832 Net earnings (loss) ................................................................ 11,820 5,610 8,360 (4,220) Basic earnings (loss) per common share ............................................. .92 .43 .64 (.32) Diluted earnings (loss) per common share ........................................... .90 .42 .63 (.32) 2000 - ---- Net sales .......................................................................... $216,730 $228,003 $212,542 $215,477 Gross profit ....................................................................... 42,624 44,677 46,141 46,106 Net earnings ....................................................................... 10,410 9,960 11,590 12,419 Basic earnings per common share .................................................... .82 .79 .91 .97 Diluted earnings per common share .................................................. .81 .77 .89 .95