*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19821
19830
19843
19855
19860
19871
19882
19891
19901
199111
19920
19932
19946
19954
19961
19979
19980
19992
20004
20011
20020
20035
20040
20050
20062
20078
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
20185
Total76