*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
199231
19932
19940
19950
19960
19970
19980
19990
20000
20014
20028
20030
20040
20050
20060
20070
20085
20090
20100
20110
20120
20131
20140
20150
20160
20177
20182
201912
20204
20212
20224
20236
20242
Total90