*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0001033743384
Feb371032511622209
Mar71642771002906
Apr239804104004423
May2411015453005795
Jun2353757182007792
Jul1261664687004979
Aug27203404003451
Sep6103369003385
Oct212064002067
Nov101309001310
Dec108511022663128
Total9528243622625680244829