*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972001001
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980001001
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994002002
1995001001
1996000000
1997000000
1998002002
1999000011
2000001001
2001001001
2002000000
2003001001
2004000000
2005000000
2006003003
2007001001
2008003003
2009003003
2010000000
2011000000
2012000000
2013000000
2014001001
2015000000
2016000000
2017000000
Total00220123