*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971000000
1972001001
1973000000
1974002002
1975001001
1976000000
1977000000
1978000000
1979000000
1980001001
1981001001
1982000000
1983000000
1984000000
1985001001
1986000000
1987000000
1988000000
1989000000
1990001001
1991000000
1992001001
1993000000
1994001001
1995001001
1996003003
1997003003
1998004004
1999002002
2000005005
200100130013
2002003003
2003008008
2004001001
2005000000
2006002002
2007002002
2008002002
2009002002
2010004004
2011001001
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
Total00700070