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1971
to
1974
2
1975
to
1979
2
1980
to
1984
2
1985
to
1989
0
1990
to
1994
0
1995
to
1999
5
2000
to
2004
8
2005
to
2009
6
2010
to
2014
7
2015
to
2016
5