*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979001001
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000303
1987000303
1988000404
1989000000
1990000202
1991000213
1992000303
1993000202
1994000101
1995000101
199600011011
1997000202
1998000000
1999001203
2000000000
2001000000
200200012012
2003000202
2004000101
2005000000
2006000303
2007000202
2008000101
2009000101
2010000000
2011000000
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
Total00258161