*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00018586
Feb004304588
Mar01971318001515
Apr58853791004681
May28121539510013132
Jun793610819920038179
Jul4138343639007514
Aug12271452001491
Sep0121290001302
Oct1065800659
Nov00560056
Dec10200224245
Total1675321615210135468948