*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977001001
1978000000
1979003003
1980000000
1981002002
1982002002
1983000000
1984000000
1985000000
1986023005
198701140015
198801180019
19890290011
199001310014
19910950014
199209050095
19930156300159
199424641400480
19950425900434
199604721200484
19970226800234
19980228300231
199905380061
20000367900376
200101981000208
200203161400330
200301401200152
200403141100325
2005044170061
200601231700140
200701282200150
20080972600123
2009012330045
201001186500183
20110597000129
201218150087
201311191400134
201408370090
2015008008
2016001001
2017000000
Total44341463004808