*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19842
19851
19862
19872
19881
19892
19900
19911
19923
19930
19940
19951
19960
19970
19981
19990
20001
20011
20021
20032
20043
20050
20060
20070
20080
20091
20100
20111
20120
20130
20140
20150
20160
20170
Total34