*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19892
19902
19918
19926
19936
19944
19952
19960
19973
19983
19990
20005
20017
20020
20030
20046
20051
20060
20072
20084
20091
20109
20113
20120
20130
20140
20150
20160
20170
Total78