*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19919
19921
19930
19945
19950
19968
19970
19981
19990
20000
20010
20020
20030
20040
20052
20064
20072
200827
200913
20106
201116
201247
201317
201412
201514
20166
20170
20180
20190
20200
20210
20220
20230
20240
Total192