*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977001001
1978000000
1979000000
1980000000
1981000000
1982001001
1983000000
1984000000
1985000000
1986000000
1987003003
1988000000
1989000000
1990000000
1991002002
1992003003
1993001001
1994002002
1995001001
1996005005
1997002002
1998001001
1999004004
2000003003
2001004004
2002001001
2003004004
2004001001
2005004004
2006003003
2007007007
2008004004
2009005005
201000180018
2011004004
2012000000
2013001001
2014000000
2015000000
2016001001
2017000000
Total00870087