*Excludes Observations that spanned multiple years

Pre 197060
19701
19710
19720
19730
19740
19751
19761
19771
19785
19790
19802
19810
19820
19830
19840
19851
19860
19871
19880
19890
19900
19910
199213
19934
19940
19950
19960
19971
19980
19990
20000
20010
20023
20030
20040
20050
20068
20071
20080
200910
20107
20111
20120
20130
20140
20150
20160
20170
Total121