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1967
to
1969
4
1970
to
1974
4
1975
to
1979
5
1980
to
1984
7
1985
to
1989
6
1990
to
1994
2
1995
to
1999
3
2000
to
2004
4
2005
to
2009
7
2010
to
2014
6
2015
to
2018
9