*Excludes Observations that spanned multiple years

Pre 197013
19700
19710
19720
19730
19740
19751
19760
19770
19781
19791
19801
19810
19820
19830
19840
19850
19860
19870
19880
19891
19901
19910
19920
19931
19942
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20192
20200
20210
20220
20230
20240
Total24