*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970003003
1970000000
1971000000
1972000000
1973003003
1974001001
1975000000
1976001001
1977000000
1978001001
1979000000
1980002002
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987002002
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995000000
1996000000
1997000000
1998000000
1999000000
2000000000
2001000000
2002000000
2003000000
2004002002
2005000000
2006001001
2007000000
2008001001
2009001001
2010001001
2011000000
2012000000
2013000000
2014000000
2015000000
2016002002
2017000000
Total00210021