*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000011
1975000000
1976000000
1977000000
1978001001
1979000000
1980000000
1981000000
1982000000
1983001001
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993001001
1994001001
1995000000
1996000000
1997000000
1998000000
1999000000
2000000000
2001101002
2002000000
2003001001
2004010001
2005000000
2006000000
2007001001
2008000000
2009000000
2010000000
2011000000
2012001001
2013000000
2014001001
2015000000
2016000000
2017000000
Total1190112