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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19871
19880
19890
19900
19910
19921
19930
19942
19950
19960
19973
19980
19990
20000
20010
20020
20030
20040
20050
20062
20070
20080
20090
20100
20110
20120
20131
20141
20150
20160
20170
20180
20190
20203
20214
20224
20234
20240
Total28