*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19891
19900
19912
19922
19934
19942
19951
19960
19971
19983
19990
20001
200111
20022
20032
20040
20050
20063
20075
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
Total43