*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19732
19740
19750
19760
19770
19781
19790
19800
19810
19820
19831
19841
19853
19861
198718
19885
19899
19901
19911
19925
19932
19946
199514
19960
19974
19981
19992
20001
20014
20020
20032
20040
20055
20064
200714
200811
20099
20109
20118
20127
20131
20142
20159
201612
20171
20180
20190
Total176