| 1978 |
| 1979 |
| 1980 |
| 1981 |
| 1982 |
| 1983 |
| 1984 |
| 1985 |
| 1986 |
| 1987 |
| 1988 |
| 1989 |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 |
| 1995 |
| 1996 |
| 1997 |
| 1998 |
| 1999 |
| 2000 |
| 2001 |
| 2002 |
| 2003 | |
| 457.5 |
446.51 |
97.6 |
| 455.1 |
443.28 |
97.4 |
| 437.95 |
424.77 |
97 |
| 418.9 |
407.28 |
97.2 |
| 389.78 |
378.28 |
97 |
| 367.53 |
358.01 |
97.4 |
| 356.6 |
348.85 |
97.8 |
| 343.07 |
336.54 |
98.1 |
| 339 |
333.24 |
98.3 |
| 314.42 |
310.03 |
98.6 |
| 302.91 |
299.46 |
98.9 |
| 311.49 |
308.58 |
99.1 |
| 312.18 |
309.86 |
99.3 |
| 345.41 |
342.99 |
99.3 |
| 337.16 |
335.2 |
99.4 |
| 336.74 |
335.06 |
99.5 |
| 348.46 |
347.42 |
99.7 |
| 346.5 |
345.62 |
99.7 |
| 347.43 |
346.84 |
99.8 |
| 356.06 |
355.63 |
99.88 |
| 356.16 |
355.87 |
99.92 |
| 346.2 |
346.03 |
99.95 |
| 329.22 |
328.99 |
99.93 |
| 331.7 |
331.6 |
99.97 |
| 336.52 |
336.49 |
99.99 |
| 316.79 |
316.73 |
99.98 | |
