*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00018508526
Feb012051221428
Mar03649300529
Apr414160300748
May76112381006500
Jun16176629180018596
Jul14631644250010755
Aug9201874001903
Sep131130001134
Oct0051600516
Nov0023000230
Dec00710705776
Total51302911084619143442641