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Year
1976
2,999
1977
3,039
1978
3,158
1979
3,309
1980
3,511
1981
3,670
1982
3,636
1983
3,718
1984
4,462
1985
4,766
1986
5,588
1987
6,680
1988
7,386
1989
7,732
1990
7,872
1991
7,600
1992
7,438
1993
8,104
1994
8,362
1995
8,682
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