*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19837
19841
19850
19860
19872
19888
198918
19905
19913
19920
19932
19941
19956
19960
19970
19980
19991
20002
20011
20025
20031
20041
20056
20060
20070
20089
20090
20102
20114
20120
20130
20140
20150
20161
20170
Total88