*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000305962
1970002046
1971001045
1972001056
1973001067
1974001045
1975001067
197600201012
197700201214
1978000066
197900101011
198000201315
198100001515
19820020810
198300301619
198400201719
198500401620
198613501322
1987011101527
1988001501732
1989012301438
1990014311634
1991392111145
199227901331
199308827012127
1994118457016258
1995417691112284
1996024045014299
19970471801277
199807230984
199901450524
200011028016127
2001069601590
2002071170795
2003259120780
20040601001080
200509141832
20061351221262
200707032012114
20081973009137
2009015380356
20103707305151
20111557601133
2012066111482
201304790083
2014016760092
2015016018
2016005005
2017001001
Total20165586775003049