*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000001313
1970000011
1971000022
1972000022
1973000011
1974000000
1975000000
1976000011
1977000000
1978000022
1979000011
1980000000
1981001023
1982001001
1983003036
1984000022
1985000033
1986002024
1987001023
1988000022
1989000077
1990000123
1991004116
1992002046
1993001056
1994001113
1995001023
1996001012
1997002013
1998001067
1999000000
2000001045
2001003025
2002004026
2003004004
2004000033
2005002057
2006002013
2007001001
20080041510
2009001045
2010000022
201100140620
2012001045
2013000000
2014000000
2015000000
2016000000
2017000000
Total00584107169