*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970003003
1970000000
1971000000
1972000000
1973000000
1974002002
1975000000
1976000000
1977001001
1978001001
1979000000
1980001001
1981001001
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993001001
1994002002
1995001001
1996001001
1997000000
1998002002
1999001001
2000001001
2001003003
2002001001
2003002002
2004002002
2005003003
2006001001
2007001001
2008000000
2009000000
2010005005
2011008008
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
Total00440044