*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979001001
1980000000
1981000000
1982000000
1983000000
1984001001
1985000000
1986000000
1987000011
1988000000
1989000011
1990000000
1991001001
1992005027
1993002013
1994003025
1995002013
1996000011
1997001012
1998000011
1999003014
2000004015
2001002013
2002003137
2003004026
2004001012
2005001102
2006003025
2007005016
2008008008
2009003025
2010003003
2011005027
2012003025
2013000011
2014000000
2015001001
2016000011
2017000000
Total006523198