*Excludes Observations that spanned multiple years

Pre 197015
19700
19710
19720
19730
19741
19750
19762
19770
19781
19790
19800
19810
19821
19830
19840
19852
19863
19870
19881
19891
19900
19911
19921
19932
19941
19952
19960
19970
19980
19990
20000
20010
20021
20031
20040
20050
20061
20070
20082
20090
20104
20111
20120
20130
20140
20150
20160
20170
Total44