*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977001001
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985001001
1986004004
1987004004
1988003003
1989004004
1990002002
1991009009
1992008008
1993006006
1994005005
1995007007
1996009009
1997004004
1998006006
1999008008
2000009009
200100100010
2002009009
2003004004
2004007007
200500100010
2006007007
2007006006
2008009009
2009008008
2010006006
201100160016
2012005005
2013004004
2014001001
2015001001
2016000000
2017000000
Total0019300193