*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan03510163181
Feb91755140122
Mar35918800214
Apr662269800390
May723621100319
Jun638737600526
Jul282716900224
Aug5213300140
Sep4713200143
Oct0111500116
Nov00830184
Dec01492707759
Total2824981514139113218