*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19830
19841
19851
19860
19870
19881
19892
19905
199147
19924
19932
19941
19953
199619
19970
19980
19990
20000
20010
20020
200311
20040
20050
20060
20070
20086
20097
20100
20111
20120
20130
20143
20150
20160
20170
20181
20191
20200
Total119