*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19840
19850
19860
19870
19880
19891
19902
19910
19920
19930
19941
19950
19960
19970
19980
19991
20000
20010
20023
20030
20040
20050
20060
20070
20080
20090
20101
20116
20122
20130
20141
20150
20160
20171
20180
20196
20200
Total27