*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00027762789
Feb023484312666
Mar3751475001553
Apr52331842002080
May165990147006153
Jun78185532690018900
Jul44794423460010334
Aug261893600980
Sep161094001101
Oct0194700948
Nov0038200382
Dec011531739894
Total17332823993932181344780