*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971001001
1972002002
1973001001
1974001001
1975000000
1976001001
1977001001
1978000000
1979000000
1980000000
1981000000
1982001001
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993001001
1994002002
1995000000
1996001001
1997000000
1998000000
1999000000
2000001001
2001000000
2002000000
2003002002
2004002002
2005002002
2006003003
2007000000
2008001001
2009000000
2010000000
2011000000
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
Total00240024