*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
198810
19890
19900
19912
19920
19931
19941
19950
19960
19970
19980
19990
20000
20010
20021
20030
20040
20050
20060
20070
20080
20090
20100
20111
20120
20130
20140
20151
20161
20170
20180
20190
20201
20211
20221
20231
20240
Total23