*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19841
19850
19862
19870
19880
19890
19900
19911
19923
19930
19941
19950
19961
19972
19980
199929
20000
200151
20020
200313
20042
20050
20061
20070
20080
20091
20103
20118
20120
20135
20141
20157
201648
201724
201817
201930
202054
202159
202230
20236
20240
Total401