*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19860
19870
19882
19891
19907
199115
19925
199314
19946
19950
19960
19970
19980
19990
20006
20010
20020
20033
20040
20050
20060
20070
20082
20090
20100
20111
20121
20135
20140
20150
20162
20171
20180
20190
Total73