*Excludes Observations that spanned multiple years

Pre 197031
19703
19710
19720
19732
19740
19753
19762
19770
19782
19799
19807
19816
19820
19830
19841
19850
19861
19871
19881
19890
19901
19911
19921
19931
19940
19951
19962
19971
19982
19991
20003
20011
20024
20034
200438
200541
20061
20070
20089
20097
20109
20114
20124
20136
20140
201514
20160
20170
Total225