*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977000011
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994010001
1995000000
1996000000
1997000000
1998000000
1999000000
2000000000
2001000000
2002000000
2003000000
2004010001
2005100001
2006010001
2007001001
2008000000
2009060006
2010022004
2011000000
2012050005
2013005005
201413540040
2015006006
2016000000
2017000000
Total251190173