*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979001001
1980002002
1981001001
1982000000
1983000000
1984000000
1985000000
1986000000
1987001001
1988000000
1989012003
1990010001
1991010001
1992001001
1993001001
1994001001
19950930012
1996014005
1997063009
1998161008
1999016007
2000002002
2001024006
200202100012
20030480012
2004118110030
200502050025
200611070018
200705110016
2008011120023
200911990029
2010023170040
201100270027
2012113005
2013003003
2014041005
2015013004
2016000000
2017000000
Total514616000311