*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700240104110
1970000044
197100001010
1972000077
1973000077
1974000055
1975000088
197600101213
197700101314
197800001111
197900201921
198000501318
198100301619
198200101617
198300201719
198400001717
198500101617
198600301417
198700702229
198800402327
198900201618
199000432229
1991001502237
199200601925
1993001202941
199400812332
199500712533
199600401721
199700702633
1998001112335
199900701421
200000913444
200100913242
2002002001535
2003001402034
2004001302538
200500603339
2006001002535
2007001213346
2008001842345
2009002201941
2010001101324
2011004612067
2012002113557
201300101516
20140071210
2015002002
2016001506
2017000202
Total02348249241298