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1971
to
1974
17
1975
to
1979
21
1980
to
1984
24
1985
to
1989
28
1990
to
1994
18
1995
to
1999
17
2000
to
2004
27
2005
to
2009
40
2010
to
2014
250
2015
to
2019
140