*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
1989000000
1990000000
1991011002
1992000000
1993000000
1994024006
1995003003
1996012003
1997000000
1998001001
1999002002
2000002002
2001001001
2002002002
2003003003
2004010001
2005000000
2006010001
2007000000
2008003003
2009000000
2010004004
2011001001
2012010001
2013001001
2014000000
2015000000
2016000000
2017000000
Total07300037