*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan000522012206
Feb0372937741509
Mar2101463001475
Apr3101485001498
May3402875002918
Jun5392608002652
Jul1151783001799
Aug2111556001569
Sep011266001267
Oct0183500836
Nov0067600676
Dec00476015031979
Total16130157528447820384