*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19861
19870
19880
19890
19900
19910
19926
19931
19941
19955
19960
19970
19980
19990
20000
20016
20023
20031
20042
20052
20063
20074
20089
20091
20102
20110
201219
20130
20140
20150
20160
20170
Total68