*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977001001
1978000000
1979000000
1980001001
1981000000
1982001001
1983000000
1984000000
1985001001
1986002002
1987007007
1988004004
1989003003
1990004004
1991008008
1992006006
1993009009
1994009009
199500130013
199600120012
1997007007
1998007007
1999007007
2000009009
200100170017
200200210021
200300110011
2004004004
2005007007
2006009009
2007007007
2008006006
200900150015
201000220022
201100170017
2012008008
2013000000
2014001001
2015000000
2016000000
2017000000
Total0025700257