*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
19870
19880
19890
19902
19912
19920
19934
19940
19950
19961
19976
19980
19990
20000
20013
200259
20030
20040
20050
20065
20070
20080
20091
201052
20116
20122
20130
20141
20150
201645
20171
20180
Total190