*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977002002
1978003003
1979000000
1980001001
1981002002
1982002002
1983001001
1984000000
1985000000
1986213006
19871450010
1988142007
1989054009
19904840016
19911660013
199231110015
1993223120037
1994420170041
19954780019
1996319130035
199733170041
199834150049
199903060036
2000547150067
200113770045
2002032150047
2003260230085
2004238100050
2005374180095
2006218200040
2007030230053
2008018370055
20090594200101
20107859500187
2011016810097
20122545700113
2013111540066
201408130021
2015006006
2016001001
2017000000
Total56787631001474