*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000000
1975000101
1976000202
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000101
1990000000
1991000000
1992000101
1993000101
1994000000
1995000000
1996000101
1997000000
1998000101
1999000000
2000000000
2001100102
2002000000
2003000101
2004000000
2005000101
2006000000
2007000303
2008000202
2009000202
2010000202
2011000101
2012000101
2013000101
2014000202
2015000101
2016000000
2017000000
2018000000
Total10027028