*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970007018
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982000000
1983000000
1984001001
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000011
1992002013
1993002002
1994000000
1995001001
1996000000
1997000000
1998000000
1999000000
2000000000
2001000000
2002001001
2003002013
2004001001
2005002002
2006002002
2007001001
2008001001
2009000000
2010000000
2011003003
2012001001
2013000000
2014000000
2015000000
2016000000
2017000000
Total00280432