*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19841
19850
19861
19870
19885
19894
19900
19910
19920
19930
19940
19950
19960
19971
19980
19990
20000
20013
20021
20032
20040
20050
20060
20072
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total22