*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974001001
1975000000
1976000000
1977002002
1978001001
1979001001
1980006006
1981002002
1982000000
1983001001
1984001001
1985000000
1986000000
1987001001
1988002002
1989000000
1990001001
1991000000
1992005005
1993002002
1994001001
1995000000
1996003003
1997000000
1998001001
1999000000
2000000000
2001002002
2002000000
2003001001
2004004004
2005000000
2006002002
2007000000
2008001001
2009000000
2010002002
2011005005
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
Total00480048