*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19910
19920
19933
19941
19950
19960
19970
19980
19990
20000
20010
20020
20030
20041
20050
20060
20070
20080
20091
20101
20111
20120
20131
20140
20151
20161
20171
20180
20191
20200
20211
20220
20230
20240
Total17