*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00027779
Feb002201739
Mar08720080
Apr03117500206
May26763500713
Jun13227866002357
Jul81186701001895
Aug81120500224
Sep0013100131
Oct0010700107
Nov00920092
Dec00430220263
Total314190164923146186