*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19823
19830
19840
19850
19860
19870
19880
19891
19902
19912
19921
19930
19940
19950
19964
19970
19981
19990
20003
20010
20020
20031
20044
20050
20063
20070
20080
20091
20100
20110
20121
20130
20140
20150
20160
20170
20180
Total29