*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
19872
19886
19891
19900
19912
19926
199314
19946
19959
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20072
20086
20093
20100
20110
20122
20130
20144
20150
20161
20170
20180
20191
20201
20214
20224
20232
20241
Total78