*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
198521
19860
19871
19880
19891
19905
199120
199231
19930
19941
19950
19960
19970
19980
19990
20000
20011
20020
20030
20040
20050
20060
20070
20080
20090
201022
201122
20122
20131
20143
20150
20162
20171
20180
20190
Total134