*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004908912
Feb003450363708
Mar181121001130
Apr1451871001917
May26591907001992
Jun1471131696001956
Jul180171252001449
Aug7112978001061
Sep15494100960
Oct3064300646
Nov1053200533
Dec00213111071321
Total445258114995237814585