*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19851
19861
19874
19889
19893
199014
19912
19929
19931
19943
19953
19960
19973
19980
19990
20000
20010
20020
20034
20042
20051
20061
20070
20082
20091
20100
20115
20120
20132
20140
20150
20160
20170
Total76