*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974001001
1975001001
1976000000
1977000000
1978000011
1979000011
1980000011
1981000000
1982000011
1983000011
1984000011
1985000000
1986000000
1987000000
1988001012
1989001012
1990000011
1991000011
1992000011
1993000011
1994000022
1995000033
1996001012
1997002046
1998000033
1999001023
2000007029
2001003069
2002002103
2003000011
2004002013
2005002002
2006002046
2007000022
2008004015
2009004037
2010000000
20110080412
2012001023
2013000000
2014000000
2015000000
2016000000
2017000000
Total004415398