*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19842
19850
19860
19870
19880
19898
19904
19912
19920
19931
19944
19951
19960
19970
19980
19990
20000
20010
20020
20034
20040
20054
20060
20075
20082
20090
20100
20110
20120
20130
20140
20150
20161
20170
20180
Total39