*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000101
1975000000
1976000101
1977000000
1978000101
1979000202
1980000000
1981100001
1982000202
1983000101
1984001001
1985000000
1986000000
1987000101
1988001618
1989000202
1990001001
1991001315
1992000505
1993001203
1994002507
1995002305
1996000606
1997001416
1998000404
1999000303
2000002507
2001102306
2002003104
2003000000
2004000101
2005000202
2006000303
2007000000
2008000000
2009000303
201010111013
2011001304
2012000101
2013000101
2014000000
2015001203
2016000303
2017000000
2018000000
Total3020923118