*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19834
19840
19850
19865
19870
19882
19893
19903
19911
19921
19933
19945
19950
19960
19972
19980
19993
20002
20012
20020
20031
20041
200511
20062
20071
200810
20091
20104
20113
20120
20130
20140
20154
20163
20171
Total78