*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000055
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000044
1977000022
1978000022
1979001023
1980004037
1981003025
1982000011
1983000022
1984000044
1985000011
1986001001
1987005049
1988003036
1989000000
1990000011
1991003025
1992005038
199300191828
1994006039
1995001247
1996004048
199700311014
1998000022
1999000000
2000000088
2001001801129
20020070310
2003001012
20040060410
200500601319
2006001702138
20070040812
200800101112
2009000011
2010001001
2011003504681
20120021394118
2013002046
2014000011
2015003014
2016005005
2017000022
Total001948291493