*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19891
19900
19910
19920
19930
19940
19950
19961
19970
19980
19990
200013
20010
20020
20030
20043
20050
20060
20070
20080
20090
20100
20114
20120
20130
20140
20150
20160
20170
201810
20191
20200
20210
20220
20234
20240
Total38