*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980001001
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988001001
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995000000
1996000000
1997000000
1998000000
1999000000
2000000000
2001000000
2002001001
2003000000
2004000000
2005001001
2006000000
2007000000
2008001001
2009000000
2010001001
2011000000
2012000000
2013001001
2014000000
2015000000
2016002002
2017001001
2018000000
2019002002
2020001001
2021002002
2022000000
2023001001
2024000000
Total00200020