*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982001012
1983000000
1984000000
1985000000
1986000000
1987010001
1988002024
1989000000
1990000000
1991011002
1992001001
1993000011
1994201003
1995001001
1996000011
1997030014
1998007018
1999001012
2000000022
2001001012
2002102036
2003215019
2004034018
2005050027
2006001023
2007004015
2008104016
2009116008
2010103015
2011004004
2012161008
201322370234
201402900029
2015013004
2016004004
2017011002
2018010001
Total127666025179