*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19860
19870
198823
19890
199010
19911
19920
19930
19941
19951
19960
19970
19980
19994
20000
20014
20020
20032
20040
20050
20060
20071
20088
20090
201010
201122
20124
20131
20143
20150
20162
20172
20180
Total102