*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
19871
19881
19890
19900
19910
19920
19930
19940
19950
19962
19970
19980
19990
20000
20010
20021
20033
20040
20050
20061
20070
20080
20091
20102
20112
201223
20135
20140
20151
20160
20170
20184
20191
20200
20210
20220
20230
20240
Total48