*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00001010
Feb000011
Mar20110013
Apr5265100658
May5331417001455
Jun131741037001242
Jul722047300565
Aug12350300518
Sep4043900443
Oct1144700449
Nov0015700157
Dec001605167
Total23213351510625578