*Excludes Observations that spanned multiple years

Pre 1970130
19705
19714
197213
19735
19744
197519
19768
19779
19784
19792
19801
19810
19824
19830
19840
19852
19860
19871
19880
19896
19901
19911
19921
19933
19946
19957
19966
199721
19987
199912
200023
200147
200246
20032
20040
20051
200622
20070
20082
20094
201056
20118
20127
201372
201425
20159
20162
Total608