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Year
1973
10
1974
18
1975
14
1977
12
1978
10
1979
10
1980
8
1981
10
1983
8
1984
8
1985
18
1988
10
1989
20
1990
10
1991
18
1993
20
1994
14
1995
12
1996
12
1999
20
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