*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19802
19811
19823
19831
19841
19850
19860
19870
19880
19890
19900
19912
19920
19931
19942
19950
19962
19970
19982
19991
20001
20013
20020
20030
20040
20050
20060
20070
20082
20090
201011
20115
20120
20132
20140
20151
20161
20171
20182
20190
20200
Total48