*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
19872
19880
19890
19900
19911
19920
19931
19941
19952
19969
19972
19981
19993
20000
20010
20020
20030
20043
20050
20063
20071
20080
20090
20100
20110
20120
20132
20140
20150
20160
20170
Total32