*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19860
198717
198815
19895
199019
19918
19920
19938
19941
19950
19960
19970
19980
19990
20000
20011
20020
20031
20040
20050
20060
20070
20080
20090
20100
20111
20120
20130
20141
20150
20161
20170
20180
20190
20200
Total81