*Excludes Observations that spanned multiple years

Pre 197013
19702
19710
19721
19730
19740
19750
19762
19771
19781
19790
19800
19811
19821
19831
19842
19851
19863
19871
19880
19890
19900
19912
19921
19930
19942
19952
19962
19972
19988
19995
20001
20010
200212
20038
200410
200539
20067
200757
2008127
200918
201079
201111
20122
201323
20142
20151
20161
20171
Total453