*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970101002
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000022
1983001001
1984000000
1985000000
1986001001
1987022015
1988000011
1989000011
1990001012
1991130004
1992014005
1993011024
1994025007
1995032005
1996010023
1997011002
1998001012
1999101002
2000010012
2001010012
2002010012
2003002002
2004110002
20050130610
2006040026
2007043029
20080820010
2009001001
2010051028
2011023005
2012070018
2013113005
2014061018
2015002013
2016001001
2017002002
Total55645029135