*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19831
19840
19854
19861
19871
198817
19891
199018
199113
199235
19939
199411
19958
199615
19976
199815
19995
20008
20014
20020
200315
20048
20059
20067
20074
20080
20093
20101
20110
20124
20131
20140
20151
20160
20170
20180
Total229