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1971
to
1974
9
1975
to
1979
13
1980
to
1984
7
1985
to
1989
26
1990
to
1994
5
1995
to
1999
22
2000
to
2004
21
2005
to
2009
23
2010
to
2014
38
2015
to
2017
27