*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970001001
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981011002
1982002002
1983000000
1984000000
1985110002
1986001001
1987022004
1988042006
1989013004
19900910010
1991243009
199212910031
199303830041
199403870045
1995027100037
199602900029
199703360039
199803930042
199901660022
200013770045
200101680024
200203470041
2003147100058
200405660062
200506910070
200604870055
2007056210077
2008048130061
200927130022
2010022350057
2011010310041
2012114250040
2013032005
2014061007
2015018009
2016000000
2017000000
Total9745247001001