*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989002002
1990001001
1991002002
1992000000
1993002002
1994003003
1995002002
1996002002
1997002002
1998001001
1999000000
2000000000
2001000000
2002005005
2003008008
2004001001
2005003003
2006004004
2007003003
2008004004
2009003003
2010007007
201100120012
2012002002
2013002002
2014002002
2015000000
2016000000
2017000000
Total00730073