*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001102
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982200002
1983000101
1984000000
1985000000
1986000101
1987100225
1988100001
1989100001
1990100102
1991001034
1992000415
1993200114
1994000527
1995000235
1996200013
1997000112
1998100102
1999001102
2000100012
2001100012
2002100012
2003000202
2004001012
20056003110
2006200046
2007200349
20080002810
2009000101
2010200158
2011000325
2012100078
2013001315
2014100168
2015100203
2016000101
2017000202
2018000000
Total29054556135