*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0006497503
Feb012110275487
Mar1476000765
Apr4569500704
May24763600667
Jun362035100407
Jul47425300304
Aug19323100253
Sep84135300438
Oct0028600286
Nov0035000350
Dec00910297388
Total215454217610695552