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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19864
19870
19882
19896
19904
19910
19924
19931
19941
19950
19960
19971
19980
19990
20000
20010
20020
20031
20040
20050
20060
20071
20080
20090
20102
20110
20122
20135
20140
20151
20161
20171
20181
20190
20200
20210
Total38