*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004523562401
Feb0781967641596
Mar2991889001990
Apr104102714003134
May2142591558005838
Jun6657883746009600
Jul6511174598005780
Aug6331820001859
Sep381810001821
Oct001209001209
Nov0082500825
Dec00428315271958
Total173117212141654464738011