*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19834
19840
19850
19861
19870
19881
19891
19900
19911
19929
19933
19942
19954
19960
19970
19980
19990
20000
20010
20020
20031
20041
20057
20060
20071
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total41