*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19811
19822
19830
19840
19850
19860
19870
19881
19893
19903
19911
19920
19931
19940
19950
19963
19972
19980
19990
20000
20014
20020
20030
20040
20051
20060
20070
20085
20092
201025
201121
20121
20133
20144
20152
20165
20170
20180
Total91