*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973100001
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000011
1982000000
1983000000
1984014005
1985020002
1986040004
1987030036
1988202004
1989090009
19907160115
1991114240057
19921113720197
199311670024
199487170638
1995431100045
1996062008
19976320112
19980830213
1999021003
2000020002
2001210014
2002213006
2003003014
2004201003
2005106018
2006000011
2007203005
2008100001
2009110013
2010322018
2011201003
2012232018
2013000000
2014070007
2015200002
2016000000
2017000000
Total81155151022409