*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19891
19900
19911
19922
19932
19940
19950
19960
19970
19981
19990
20000
20010
20023
20030
20042
20050
20060
20070
20081
20090
20101
20110
20120
20131
20142
20150
20160
20171
20180
20191
20202
20211
20225
20235
20241
Total34