*Excludes Observations that spanned multiple years

Pre 19704
19701
19710
19721
19735
19742
19751
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19883
19891
19900
19910
19920
19930
19940
19950
19961
19971
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total21