*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19833
19842
19850
19861
19870
19880
19891
19901
199117
19920
19932
19942
19952
19960
19970
19980
19990
20000
20010
20020
20031
20040
20051
20061
20070
20084
20094
20100
20110
20120
20130
20140
20150
20160
20170
Total47