*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19734
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19843
19852
19860
19871
19882
19890
19900
19910
19920
19930
19940
19951
19960
19970
19980
19990
20000
20013
20020
20030
20040
20050
20060
20070
20080
20090
20100
2011102
201263
2013176
2014405
2015151
20161003
20170
20180
Total1917