*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003838
Feb00150621
Mar30820085
Apr19769100717
May4791541001597
Jun119221706001847
Jul3491069001112
Aug121078001081
Sep6180000807
Oct0028100281
Nov00600060
Dec001605874
Total22950733901027720