*Excludes Observations that spanned multiple years

Pre 19700
19701
19711
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19917
19920
19939
19945
19950
19965
19971
19980
19992
20002
20014
20020
20031
20044
20056
20061
20070
20081
20090
20101
20113
20120
20131
20140
20151
20162
20171
20180
Total62