*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00001818
Feb0080412
Mar12044400465
Apr62249300521
May146264400684
Jun385304800616
Jul174220800267
Aug5313900147
Sep0116800169
Oct0011900119
Nov00200020
Dec00801422
Total81124416990363060