*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197011002013
1970000000
1971000000
1972000000
1973000000
1974000000
1975500005
1976000000
1977100001
1978300003
1979100001
1980300104
1981000000
1982000000
1983100001
1984700007
1985800008
1986200204
1987500106
1988000000
1989400206
1990000011
1991200518
1992300115
1993100337
19942002812
1995400165070
199610071523
199720010416
199840021420
1999100203
2000100225
2001300317
2002310408
2003100001
2004100214
2005200103
2006200529
2007000303
20083008112
200950022330
2010000132134
20111005410
20120004812
2013000404
2014000022
2015000000
2016000000
2017000000
2018000000
Total9310132142368