*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000202
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000101
1982000000
1983000000
1984000000
1985000000
1986000404
1987000505
1988000202
1989000101
1990000404
199100014014
1992000202
1993000808
199400012012
199500010010
1996000707
199700012012
1998000606
199900013013
200000013013
200100014014
200200010010
200300010010
2004000909
2005000404
200600010010
2007000707
200800010010
200900018018
201000012012
201100014014
2012000202
2013000303
2014000000
2015000101
2016000000
2017000000
2018000000
Total0002400240