*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0002364366
Feb00103092195
Mar01044400454
Apr0191743001762
May61303234003370
Jun662202975003261
Jul922059800710
Aug22340500430
Sep1245000453
Oct0058600586
Nov0032400324
Dec001180471589
Total18740410980292712500