*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970013004
1970000000
1971001001
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980001001
1981010001
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990011002
1991000000
1992000000
1993000000
1994001001
1995000000
1996000000
1997011002
1998000000
1999003003
2000001001
2001011002
2002014005
2003013004
2004011002
2005004004
2006051006
20070640010
2008002002
2009001001
201000110011
2011018009
2012050005
2013001001
2014002002
2015002002
2016000000
2017000000
Total025570082