*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19814
19820
19831
19841
19850
19860
19871
19881
19890
19902
199111
19923
19938
19940
19951
19962
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20141
20150
20160
20170
Total38