*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19901
19913
19922
19930
19940
19954
19960
19970
19980
19990
20000
20012
20021
20030
20040
20051
20062
20070
20085
20090
201011
201120
20125
20130
20144
20157
20166
20171
20180
Total76