*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
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19991
20001
20011
20020
20030
20042
20050
20061
20070
20081
20090
20100
20111
20122
20133
20141
20150
20160
20173
201814
20192
20205
20211
20228
20233
20240
Total50