*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970014005
1970000000
1971000000
1972000000
1973000000
1974000000
1975001001
1976001001
1977000000
1978000000
1979000000
1980000000
1981001001
1982000000
1983000000
1984100001
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995010001
1996000000
1997000000
1998110002
1999000000
2000000000
2001000000
2002112004
2003001001
2004010001
2005021003
2006000000
2007001001
2008020002
2009011002
2010012003
2011002002
2012001001
2013001001
2014000000
2015123006
2016010001
2017001001
Total414230041