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1971
to
1974
17
1975
to
1979
19
1980
to
1984
21
1985
to
1989
22
1990
to
1994
13
1995
to
1999
11
2000
to
2004
22
2005
to
2009
17
2010
to
2014
96
2015
to
2017
19