*Excludes Observations that spanned multiple years

Pre 19704
19702
19713
19721
19730
19740
19750
19763
19771
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19890
19900
19910
19920
19930
19940
19951
19960
19970
19982
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20151
20160
20170
Total19