*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004231235
Feb0069061130
Mar01313700150
Apr16836600435
May41164760001928
Jun27974968001969
Jul665835800482
Aug441124900304
Sep6326200271
Oct0130300304
Nov0017400174
Dec00570457514
Total1482292370347496896