*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979010001
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986001001
1987001001
1988000000
1989003003
1990012003
1991104005
1992202004
1993101002
1994034007
19951360010
1996012003
1997101002
1998016007
1999014005
2000012003
2001004004
200200110011
2003027009
200403390042
20050730010
200643220029
200704230027
2008016007
2009004004
201011340036
2011007007
2012001001
2013011002
2014012003
2015001001
2016001001
2017000000
Total113520500251