*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19821
19830
19840
19852
19860
19870
19885
19892
19908
19911
199211
19938
19943
19951
19967
19973
19982
19990
20004
20014
20020
20030
20048
20053
20060
20071
20080
20092
20101
20110
20120
20130
20140
20150
20160
20170
Total78