*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19912
19923
19939
19942
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20101
20111
20120
20134
20142
20151
20161
201726
20180
20192
20200
20214
20220
20230
20240
Total61