*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00028178206
Feb0065338106
Mar00870087
Apr06700076
May311127800392
Jun2220144500668
Jul1310918000302
Aug5313800146
Sep0013300133
Oct00670067
Nov00750075
Dec00643832899
Total4343016023410483157