*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19910
19921
19933
19943
19954
19960
19970
19980
19990
20000
20012
20020
20030
20041
20050
20060
20070
20080
20090
20100
20112
20124
20130
20140
20152
20164
20171
20180
20190
20200
20210
20220
20230
20240
Total31