*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19763
19770
19781
19790
19800
19810
19821
19830
19840
19854
19860
19870
19880
19890
19900
19910
19921
19931
19940
19950
19960
19970
19980
19991
20004
20013
20020
20030
20040
20051
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total20