*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19701810010
1970000000
1971000000
1972020002
1973010001
1974010001
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986001001
1987000000
1988000000
1989001001
1990000000
1991000000
1992000000
1993000000
1994000000
1995000000
1996000000
1997000000
1998000000
1999031004
2000010001
2001010001
2002012003
2003001001
2004000000
2005001001
200603080038
2007000000
2008000000
2009000000
2010032005
2011002002
2012000000
2013001001
2014010001
2015000000
2016002002
2017001001
Total152240077