*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0001204205
Feb00131092223
Mar151593001599
Apr3181504001525
May33791554001666
Jun431331304001480
Jul32821000250
Aug6225900267
Sep0132700328
Oct0035100351
Nov0024800248
Dec00860425511
Total118246756717218653