*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19761
19771
19780
19791
19800
19811
19820
19830
19840
19851
198618
19870
19882
198918
19900
19911
19920
19934
19941
19950
19960
19970
19980
19992
20007
20013
20020
20030
20040
20050
20061
20070
20086
20090
20103
201110
20120
20131
20140
20150
20161
20171
20183
20197
20200
Total95