*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19911
19920
19930
19942
19950
19961
19970
19983
19990
20002
20015
20022
20030
20040
20050
20061
20070
20080
20090
20100
20112
20120
20130
20140
20150
20160
20170
Total23