*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0230104109
Feb002212447
Mar35145900108
Apr983726100396
May1152054300678
Jun10648911001065
Jul652057800663
Aug17740900433
Sep0019700197
Oct00560056
Nov00310031
Dec10330403437
Total437148310315314220