*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19851
19860
19871
19881
19894
19901
19919
199211
19934
19948
19954
19961
19971
19980
19990
20000
20016
20021
20032
20041
20051
20064
20070
20080
20093
20102
201111
20122
20130
20140
20151
20160
201734
20182
20192
20202
20211
20220
20232
20240
Total124