*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000101
1975000000
1976000000
1977001001
1978000000
1979000101
1980000101
1981000000
1982000000
1983000000
1984000000
1985000000
1986000011
1987100304
1988000101
1989000101
1990000101
1991100001
1992000000
1993001001
1994200305
1995010113
1996000303
1997200103
1998100203
1999000303
2000000022
2001000213
2002000202
2003000011
2004000000
2005000213
2006201126
2007100012
2008000213
2009000303
2010000202
2011000112
2012000101
2013000101
2014000000
2015000202
2016000101
2017000000
2018000000
Total1013431269