*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993001001
1994000000
1995000000
1996001001
1997000000
1998000000
1999000000
2000000000
2001000000
2002000000
2003000000
2004000011
2005001012
2006003003
2007002013
2008004015
2009000011
2010002002
2011009009
2012006118
2013001001
2014001001
2015000000
2016000000
2017000000
Total00311638