*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995000000
1996002002
1997001001
1998000000
1999000000
2000001001
2001000000
2002002013
2003000000
2004001001
2005010001
2006121004
2007001001
2008001001
2009013004
2010023005
2011005005
2012002002
2013000000
2014001001
2015000000
2016000000
2017001001
Total16250133