|  | | Record date | Stock event | | September 27, 2000 | 2 for 1 split | | June 21, 1996 | 2 for 1 split | | March 24, 1995 | 2 for 1 split | | August 1, 1983 | 2 for 1 split | | June 17, 1981 | 2 for 1 split | | June 27, 1979 | 2 for 1 split | | February 25, 1970 | 2 for 1 split | | September 1, 1960 | 3 for 1 split | | November 6, 1957 | initial public offering |
| Record date | Stock event | | December 31, 1997 | 2 for 1 split | | July 14, 1997 | 5 for 2 split | | May 31, 1994 | 3 for 1 split |
| Record date | Stock event | | February 14, 1992
| 2 for 1 split | | February 16, 1990 | 2 for 1 split | | May 16, 1985 | 2 for 1 split |
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