*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984001001
1985000000
1986000000
1987000000
1988000000
1989001001
1990000000
1991000000
1992000000
1993002002
1994000011
1995002002
1996001012
1997001001
1998002002
1999002002
2000000000
2001004004
2002002002
2003006006
2004003014
2005001001
2006000000
2007003003
2008002002
2009002002
2010000000
2011001001
2012002002
2013000000
2014000000
2015000000
2016000000
2017000000
Total00400343