*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988001001
1989000000
1990000000
1991000000
1992001001
1993000000
1994000000
1995001001
1996000000
1997002002
1998002002
1999000000
2000001001
2001003003
2002004004
2003002002
2004021003
2005002002
2006002002
2007008008
2008002002
2009002002
2010006006
2011002002
2012001001
2013002002
2014004004
2015005005
2016007007
2017013004
2018007007
2019021003
202000100010
2021007007
2022010001
2023000000
2024000000
Total16890096