*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19780
19791
19800
19810
19821
19830
19840
19850
198613
19870
19884
19890
19900
19910
19920
199321
19941
19951
19962
19974
19980
19990
20000
20010
20020
20030
20040
20055
20062
20070
20086
20090
201014
201127
20120
20133
20144
20153
20161
20171
20180
201915
20200
Total130