*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19960
19970
19980
19991
20000
20010
20020
20031
20040
20050
20061
20070
20080
20090
20103
20112
20120
20130
20141
20154
20169
20170
201815
20193
20202
20215
20223
20232
20240
Total54