*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19801
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19921
19930
19940
19950
19960
19970
19980
19990
20000
20011
20021
20030
20040
20050
20063
20070
20080
20090
201016
20114
20122
201311
201413
20158
201613
20170
201810
20190
Total87