*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003360616094
Feb853120322021884356
Mar662814195004938
Apr9831032945004031
May852813450004383
Jun594993222003915
Jul220332981003234
Aug74142353002441
Sep1031784001797
Oct232098002103
Nov222518002522
Dec101568637685343
Total348545029146591201745157