*Excludes Observations that spanned multiple years

Pre 197021
19700
19711
19721
19730
19740
19750
19760
19771
19780
19790
19800
19810
19820
19830
19841
19851
19860
19870
19880
19890
19900
19910
19920
19933
19940
19951
19960
19970
19980
19991
20005
20010
20020
20030
20040
20050
20061
20071
20080
20091
20101
20111
20121
20131
20141
20151
20160
20170
20181
20199
20202
20213
20226
20231
20245
Total72