*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
1987000011
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994001001
1995000000
1996000000
1997000000
1998000000
1999001001
2000000000
2001000000
2002000011
2003000000
2004001001
2005000000
2006002002
2007000011
2008000000
2009000000
2010000000
2011000000
2012001001
2013000011
2014000000
2015001001
2016000000
2017001001
2018000000
2019000000
2020002002
2021001001
2022000000
2023000000
2024000000
Total00110415