*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000101
1972000000
1973000000
1974000000
1975000000
1976000202
1977000000
1978000000
1979000000
1980000000
1981000101
1982000000
1983000202
1984000000
1985000202
1986000101
1987000000
1988000000
1989000000
1990000000
1991000000
1992000303
1993000101
1994000000
1995000000
1996000000
1997000000
1998000000
1999000000
2000000000
2001000101
2002000000
2003000101
2004000000
2005000000
2006000101
2007000000
2008000000
2009000202
2010000000
2011000101
2012000000
2013000000
2014000000
2015000000
2016000101
2017000000
2018000000
Total00021021