*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000101
1974000101
1975000000
1976000000
1977000000
1978000000
1979000202
1980000000
1981000202
1982000101
1983000000
1984000000
1985000101
1986000101
1987000101
1988000101
1989000101
1990000000
1991000000
1992000303
1993000101
1994000404
199500010010
1996000202
1997000909
1998000202
1999000606
2000000101
2001000707
200200015015
2003000404
2004000606
2005000202
2006000202
2007000505
2008000808
2009000303
2010000909
201100022022
2012000303
2013000303
2014000101
2015000000
2016000000
2017000202
2018000000
Total0001420142