*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00012694706
Feb121853206397
Mar01048200492
Apr23585900896
May16571118001191
Jun235785300933
Jul691343800520
Aug65637200443
Sep36635500397
Oct9233700348
Nov1223600239
Dec001201565686
Total22219053551614657248