*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19831
19840
19853
19861
19871
198817
19891
199017
199111
199233
19938
199411
19958
199614
19976
199814
19995
20008
20014
20020
200314
20048
20058
20066
20073
20080
20091
20101
20110
20121
20130
20140
20151
20160
20170
Total208