*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975001001
1976002002
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989001001
1990000000
1991000000
1992001001
1993001001
1994000000
1995000000
1996001001
1997000000
1998001001
1999000000
2000000000
2001001012
2002000000
2003001001
2004000000
2005001001
2006000000
2007003003
2008002002
2009002002
2010002002
2011001001
2012001001
2013001001
2014002002
2015001001
2016000000
2017000000
Total00270128