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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19926
19933
19940
19950
19960
19970
19980
19992
20001
20010
20020
20030
20040
20050
20060
20071
20081
20090
20101
20110
20120
20130
20140
20154
20160
20170
20180
20190
20200
20210
Total21