*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970003003
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988001001
1989000000
1990001001
1991000000
1992000000
1993000000
1994003003
1995001001
1996001001
1997001001
1998000000
1999000000
2000002002
200122140018
200274350046
200391240034
2004010001
2005017008
2006000000
2007033006
2008001001
2009002002
2010002002
2011001001
2012010001
2013005005
2014002002
2015003003
2016002002
2017000000
Total181311500146