*Excludes Observations that spanned multiple years

Pre 197024
19700
19710
19722
19731
19740
19753
19760
19771
19781
19792
19801
19811
19820
19830
19841
19851
19861
19870
19880
19891
19902
19916
19924
19932
19944
19951
19964
199711
19982
19992
20002
20011
20021
20031
20040
20050
20061
200710
20082
2009243
20102
20111
20128
20136
20149
20158
201634
201710
20181
Total418