*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970002002
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986001001
1987000000
1988000000
1989001001
1990000000
1991000000
1992000000
1993000000
1994000000
1995000000
1996000000
1997001001
1998000000
1999001001
2000000000
2001000000
2002001001
2003000000
2004002002
2005001001
2006000000
2007000000
2008001001
2009001001
2010000000
2011000000
2012000000
2013001001
2014001012
2015003003
2016000000
2017000000
Total00190120