*Excludes Observations that spanned multiple years

Pre 197038
19700
19710
19720
19730
19740
19751
19761
19773
19782
19790
19800
19810
19820
19830
19841
19851
19861
19870
19880
19890
19900
19911
19921
19930
19940
19950
19960
19970
19983
19990
20000
20011
20020
20030
20040
20050
20060
20070
20080
20091
20100
20112
20121
20130
20141
20150
20160
20170
20180
Total59