*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19820
19830
19841
19852
19860
19870
19880
19890
19900
19911
19923
19930
19941
19950
19960
19970
19980
19990
20002
20013
20021
20030
20040
20051
20060
20071
20081
20091
20104
20111
20121
20130
20141
20150
20160
20170
20180
20190
20200
20218
20229
20236
20242
Total52