*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00216134152
Feb004503984
Mar01014100151
Apr32430700334
May75056500622
Jun162531524001793
Jul106043200502
Aug4734100352
Sep2628600294
Oct0219300195
Nov0011500115
Dec00592480541
Total424124010186535135