*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19822
19830
19842
19850
19861
19871
19881
19890
19901
19911
19922
19930
19941
19950
19962
19970
19980
19990
20000
20011
20022
20030
20040
20050
20060
20070
20080
20092
20103
20111
20121
20134
20140
20151
20160
20170
20181
20190
20200
Total32