*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19742
19750
19760
19770
19780
19790
19801
19810
19821
19831
19841
19850
19861
19870
19880
19891
19901
19910
19921
19930
19940
19950
19961
19970
19980
19990
20001
20013
20020
20030
20040
20050
20061
20070
20080
20090
20100
20111
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
Total17