*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00216134152
Feb004503984
Mar01014100151
Apr32430800335
May75156600624
Jun162551524001795
Jul106043200502
Aug4734100352
Sep2628600294
Oct0219300195
Nov0011500115
Dec00592480541
Total424154012186535140