*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977000000
1978000000
1979000000
1980001001
1981000000
1982000000
1983100001
1984000000
1985001001
1986000000
1987000000
1988000000
1989000000
1990001001
1991100001
1992001001
1993000000
1994300003
1995100001
1996000000
1997100001
1998100001
1999000000
2000102003
2001000000
2002031004
200301410015
200401030013
2005102003
2006111003
2007233109
2008114006
2009211004
2010011002
2011033006
20120650011
2013004004
2014011002
2015013004
2016000000
2017000000
Total16464110104