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Year
1900
2
1968
1
1970
2
1971
2
1972
2
1974
2
1975
1
1977
7
1980
5
1981
1
1982
1
1983
2
1984
5
1985
2
1986
9
1987
4
1988
9
1989
2
1990
5
1991
6