*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19841
19850
19861
19870
19880
19890
19900
19910
19920
19930
19940
19950
19961
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20111
20120
20130
20140
20150
20160
20170
20180
20191
20200
20210
20220
20230
20240
Total8