*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19833
19840
19850
19862
19870
19881
19891
19900
19910
19921
19931
19941
19950
19960
19970
19981
19990
20000
20010
20020
20030
20040
20050
20060
20071
20080
20090
20102
20110
20120
20130
20140
20151
20160
20170
Total22