*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995001001
1996002002
1997000000
1998000000
1999000000
2000000000
2001002002
2002001001
2003000000
2004001001
2005000000
2006006006
2007004004
2008006006
2009004004
2010003003
2011001001
2012000000
2013001001
2014000000
2015001001
2016002002
2017002002
2018003003
2019001001
2020003003
2021008008
2022000000
2023000000
2024000000
Total00520052