*Excludes Observations that spanned multiple years

Pre 197010
19700
19710
19721
19730
19741
19752
19760
19770
19780
19790
19802
19810
19823
19833
19840
19850
19860
19870
19880
19891
19901
19910
19920
19932
19943
19951
19960
19970
19980
19990
20002
20010
20020
20030
20041
20050
20060
20070
20080
20090
20101
20110
20120
20130
20140
20150
20162
20170
20180
20190
20200
20210
20220
20230
20240
Total36