| Year | Distance |
|---|---|
| 1976 | 3,520 |
| 1977 | 5,120 |
| 1978 | 7,538 |
| 1979 | 8,144 |
| 1980 | 7,482 |
| 1981 | 5,911 |
| 1982 | 5,933 |
| 1983 | 7,469 |
| 1984 | 6,857 |
| 1985 | 7,190 |
| 1986 | 6,775 |
| 1987 | 8,143 |
| 1988 | 7,366 |
| 1989 | 7,784 |
| 1990 | 7,869 |
| 1991 | 6,943 |
| 1992 | 7,586 |
| 1993 | 9,762 |
| 1994 | 6,299 |
| 1995 | 6,272 |
| 1996 | 4,853 |
| 1997 | 8,028 |
| Total | 152,844 |