*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
198611
19871
19880
198913
199036
199116
19920
19932
19941
19951
19965
19970
19980
19990
20000
20011
20020
20035
20040
20050
20060
20070
20080
20090
20107
20112
20120
20130
20141
20150
20161
20170
20181
20191
20200
Total105