*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971001001
1972000000
1973003003
1974000000
1975000000
1976000000
1977005005
1978000000
1979000000
1980001001
1981001001
1982002002
1983000000
1984000000
1985001001
1986001001
1987001001
1988002002
1989002002
1990002002
1991004004
1992001001
1993002002
1994001001
1995001001
1996003003
1997003003
1998004004
1999004004
2000004004
2001005005
2002001001
2003003003
2004002002
2005000000
2006002002
2007000000
2008003003
2009006006
2010001001
2011001001
2012000000
2013001001
2014000000
2015000000
2016000000
2017000000
Total00750075