*Excludes Observations that spanned multiple years

Pre 1970147
19702
19711
19720
19734
197413
19758
19763
19773
19782
19790
19801
19810
19822
19833
19841
19850
19862
19870
19880
19890
19902
199140
199219
199328
199428
199584
199690
199768
199885
1999106
200067
2001157
2002147
2003199
2004204
200577
2006172
200765
2008165
200995
2010116
201145
201239
201369
201450
201525
201665
20177
Total2506