*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982000000
1983000000
1984000000
1985000000
1986000000
1987011002
1988000000
1989000000
1990010001
1991012003
1992001001
1993010001
1994020002
1995044008
1996033006
1997034007
1998013004
1999014005
2000041005
2001003003
200201110012
2003007007
2004003003
2005001001
2006002002
2007008008
20080280010
2009011002
201006130019
201102200022
2012041005
2013004004
2014001001
2015001001
2016000000
2017000000
Total03810800146