Years | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 |
Peak | 2994 | 3038 | 2614 | 3667 | 3927 | 3691 | 4479 | 4336 | 5041 |
Years | 1989 | 1990 | 1991 |
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Peak | 3992 | 5602 | 4245 |
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