*Excludes Observations that spanned multiple years

Pre 197037
197010
19711
19720
19731
19742
19753
19765
197713
19788
197916
198019
19813
19821
19832
19841
19852
19861
19871
19881
19890
19900
19910
19920
19931
19941
19953
19961
19973
19981
19991
20003
20012
20022
20030
200424
200511
20060
20070
200811
20098
20103
20113
20126
20130
20146
20153
20160
20172
20183
20198
20201
20213
20223
20234
20241
Total245