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1980
to
1981
539
1982
to
1983
500
1984
to
1985
446
1986
to
1987
435
1988
to
1989
406
1990
to
1991
315
1992
to
1993
367
1994
to
1995
287
1996
to
1997
311
1998
to
1999
271
2000
to
2001
289