*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197005120017
1970001001
1971080008
1972001001
1973004004
1974001001
1975021003
1976001001
1977101002
1978011002
1979003003
1980010001
1981001001
1982002002
1983022004
1984024006
1985031004
1986022004
198702100012
19880890017
19890480012
199012090030
199121970028
1992130190050
199315970067
199421822300207
1995158100069
199601001200112
19971106600113
199811051400120
199906370070
200001592300182
20010165900174
200202412700268
200302542500279
200412171800236
200521552600183
200621723700211
200711884500234
200811304600177
20091586900128
2010231710800427
201116310100165
201271888000275
2013529710400406
201433319600430
2015239011800510
2016643616300605
2017748212200611
2018351621200731
2019557023100806
20204802386001192
20211809338001148
20221765265001031
202303170020
2024000000
Total66849028450011401