*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700010102103
1970000033
197100001010
1972000077
1973000066
1974001056
1975000088
197600201214
197700101213
197800101011
197900401519
198000101415
198100201719
198200401923
198300101617
198400001919
198500101920
198600402226
198700502429
198800302023
198900202022
199000211821
1991001931941
1992001102233
199300802331
1994001212538
1995001512339
1996002901948
1997001112335
1998002302447
199900601925
2000001102435
2001001303245
2002002601642
2003001201729
2004001202436
200500702532
2006001612744
2007001022739
2008002432148
2009001301124
2010001901029
2011004702471
2012001501934
20130092213
2014004026
2015008019
2016000000
2017000000
Total00415158771307