*Excludes Observations that spanned multiple years

Pre 19703
19703
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19811
19821
19831
19841
19851
19861
19871
19881
19891
19901
19911
19921
19931
19941
19951
19961
19971
19981
19991
20001
20011
20021
20031
20041
20054
20061
20070
20083
20099
20101
20110
20120
20130
20140
20151
20160
20170
Total50