*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971001001
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980001001
1981000000
1982000000
1983000000
1984000000
1985001001
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994001001
1995001001
1996001001
1997000000
1998000000
1999000000
2000000000
2001000000
2002000000
2003000000
2004000000
2005000000
2006000000
2007000000
2008002002
2009000000
2010000000
2011000000
2012002002
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
2019000000
2020000000
2021000000
2022001001
2023000000
2024000000
Total00150015