*Excludes Observations that spanned multiple years

Pre 197015
19701
19710
19720
19732
19740
19750
19760
19773
19781
197910
19803
19810
19821
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19942
19950
19960
19970
19980
19992
20000
20010
20020
20031
20048
200512
200615
20070
20085
20090
20101
20111
201214
20130
20140
20152
20160
20170
Total100