*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000101
1978000000
1979000000
1980000101
1981000000
1982000101
1983000000
1984000000
1985000101
1986000202
1987000707
1988000404
1989000303
1990000404
1991000808
1992000606
1993000909
1994000909
199500013013
199600012012
1997000707
1998000707
1999000707
2000000909
200100017017
200200021021
200300011011
2004000404
2005000707
2006000909
2007000707
2008000606
200900015015
201000022022
201100017017
2012000808
2013000000
2014000101
2015000000
2016000000
2017000000
2018000000
Total0002570257