*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19891
19900
19912
199214
19930
19941
19956
19960
19970
19981
19992
20000
20010
20020
20031
20040
20054
20060
20070
20082
20090
20102
20111
20120
20130
20140
20150
20160
20170
Total39