*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19721
19730
19742
19751
19761
19771
19780
19790
19800
19812
19821
19830
19840
19851
19860
19870
19880
19890
19900
19910
19920
19932
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total17