*Excludes Observations that spanned multiple years

Pre 19708
19700
19710
19720
19730
19740
19751
19761
19771
19781
19790
19800
19810
19820
19830
19841
19850
19860
19873
19882
19891
19900
19910
19920
19930
19949
199511
19965
19970
19980
19990
20001
20010
20022
20030
20040
20051
20061
20070
20080
20092
20103
20110
20121
20130
20140
20150
20160
20170
Total55