*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977001001
1978000000
1979001001
1980001001
1981002013
1982002002
1983000000
1984000000
1985000011
1986013004
1987003003
1988012003
1989032005
1990013004
1991022004
199211120014
19931270010
1994135009
19950370010
199616100017
19971290012
1998033006
1999032005
2000143008
2001004004
2002034007
20030290011
200402110013
200501170018
2006005005
2007108009
2008018009
200901180019
201001140015
201100140014
2012001001
2013025007
2014002002
2015001001
2016010001
2017000000
Total75919102259