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1967
to
1969
4
1970
to
1974
8
1975
to
1979
23
1980
to
1984
39
1985
to
1989
52
1990
to
1994
19
1995
to
1999
29
2000
to
2004
27
2005
to
2009
47
2010
to
2014
33
2015
to
2018
25