*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004255259
Feb0074375152
Mar0114300144
Apr0933100340
May42953252003209
Jun83247272003527
Jul26594785001405
Aug97775800862
Sep1150100503
Oct0030600306
Nov0014900149
Dec00781625704
Total13668123649895511560