| Year | NYSE Close |
| 1966 | 43.72 |
| 1967 | 53.83 |
| 1968 | 58.9 |
| 1969 | 51.53 |
| 1970 | 50.23 |
| 1971 | 56.23 |
| 1972 | 64.48 |
| 1973 | 51.82 |
| 1974 | 36.13 |
| 1975 | 47.64 |
| 1976 | 57.88 |
| 1977 | 52.5 |
| 1978 | 53.62 |
| 1979 | 61.95 |
| 1980 | 77.86 |
| 1981 | 71.11 |
| 1982 | 81.03 |
| 1983 | 95.18 |
| 1984 | 95.89 |
| 1985 | 121.59 |
| 1986 | 138.58 |
| 1987 | 138.23 |
| 1988 | 156.26 |
| 1989 | 195.04 |
| 1990 | 180.49 |
| 1991 | 229.44 |
| 1992 | 240.21 |
| 1993 | 259.08 |
| 1994 | 250.94 |
| 1995 | 329.51 |
| 1996 | 392.3 |