*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004318
1970000000
1971000000
1972000000
1973000000
1974000000
1975000202
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000011
1987000112
1988000202
1989000224
1990100023
1991000279
1992000202
199300012223
199400028183
199500256370
199600113941
199700141419
199800007777
199900032124
200000147580
200100043135
200210069198
200300027880
20040000128128
200500251724
200600056772
200700042024
200800061218
2009001172543
2010000131528
2011000231841
201220011619
201300082432
201400096372
2015000404
2016000101
2017000000
2018000000
Total401214210111169