*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000101
1980000000
1981000101
1982000000
1983000000
1984000000
1985000101
1986000303
1987000505
1988000303
1989000303
1990000303
199100018018
199200010010
1993000606
1994000707
199500010010
199600011011
1997000909
199800012012
1999000909
200000015015
200100017017
200200017017
200300010010
2004000606
200500028028
200600014014
200700012012
2008000404
200900016016
2010000808
201100013013
2012000303
2013000404
2014000000
2015000000
2016000000
2017000000
2018000000
Total0002790279