*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19761
19770
19781
19791
19801
19811
19820
19830
19841
19852
19860
19870
19880
19892
19901
19910
19921
19931
19941
19951
19960
19970
19982
19994
20000
20014
20020
20030
20040
20050
20060
20070
20080
20092
20107
20112
20120
20135
20140
20150
20162
20171
20184
20191
20200
Total51