*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0005619341990
Feb01168556521353
Mar0951243001338
Apr92311158001398
May182185207002410
Jun242012236002272
Jul19811026001126
Aug5472500734
Sep1266400667
Oct0168200683
Nov0062600626
Dec00361514861852
Total764622761366407216449