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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
19851
19860
19870
19880
19890
19908
19910
19920
19936
19947
19951
19960
19970
19980
19990
20000
20010
20021
20030
20040
20050
20060
20071
20080
20090
20104
20111
20125
20136
20140
20151
20163
20174
20181
20190
20200
20210
20220
20230
20240
Total50