*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00010171181
Feb91351148122
Mar35918900215
Apr662269800390
May723621100319
Jun638737600526
Jul282716900224
Aug5213400141
Sep4713200143
Oct0111500116
Nov00840084
Dec00612696759
Total2824901520139153220