*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
19874
19885
19896
19900
19911
19928
19934
19941
19956
19960
199715
19980
19992
20007
20010
20020
20030
20041
20051
20061
20070
20085
20090
201018
201116
20120
20131
20140
20150
20161
20170
Total103