*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979001001
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986001001
1987002013
1988005016
1989000011
1990002002
1991004004
1992003003
1993000000
1994005005
1995004004
1996003003
1997004004
1998001001
1999004004
2000001001
2001006006
2002004004
2003006006
2004001001
2005000000
2006002002
2007003003
2008005005
2009002002
2010001001
2011006006
2012000000
2013000011
2014000000
2015000000
2016000000
2017000000
Total00760480