*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00027678
Feb002001636
Mar07680075
Apr02316400187
May26263500663
Jun12221665002293
Jul71168655001830
Aug81019600214
Sep0012200122
Oct0010400104
Nov00870087
Dec00420220262
Total294050155823125951