*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970002002
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977001001
1978000000
1979010001
1980000000
1981000000
1982000000
1983000000
1984000000
1985011002
1986002002
1987003003
1988001001
1989005005
1990022004
1991010001
1992012003
1993031004
1994060006
1995020002
1996032005
1997012003
1998022004
1999022004
2000011002
2001011002
2002027009
200311100012
200403100013
200505150056
2006015006
2007043007
200811160018
200908110019
2010052007
2011010100020
20121970017
201302490033
201401260018
2015033006
201610200021
2017000000
Total416115500320