*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000101
1983000000
1984000000
1985000101
1986000000
198700012012
198800014014
198900018018
1990000123
1991000000
19920000120120
19930002270272
199400012568580
19950001511512
19960001616617
19970002507509
19980002199201
199900025658
200000011386397
20010008312320
200200113402416
200300013345358
20040006397403
200500089098
20060008142150
200700018333351
200800122211234
200900019423
201000045127172
20110002477101
201200057075
20130015175181
201400112161174
20150009110
2016000077
2017000000
2018000000
Total00429560896388