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Year
1970
1,946
1971
2,390
1972
2,464
1973
2,382
1974
2,350
1975
2,368
1976
2,520
1977
2,586
1978
3,040
1979
2,988
1980
3,022
1981
2,846
1982
2,744
1983
2,342
1984
2,434
1985
2,118
1986
1,954
1987
2,214
1988
2,412
1989
2,188
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