*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00002828
Feb002046
Mar04160020
Apr019853000728
May22434455002891
Jun223400143003565
Jul2615441510003080
Aug241157400609
Sep151795001801
Oct1068000681
Nov00240024
Dec00150112127
Total7675965744014413560