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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19832
19840
19850
19860
19871
19880
19890
19900
19910
19922
19933
19940
19951
19963
19970
19980
19990
20003
20010
20020
20030
20040
20050
20060
20070
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
Total17