*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003838
Feb011101527
Mar00280028
Apr1111999001021
May649642686003399
Jun7241281709002561
Jul12791363072004487
Aug199201064001283
Sep71242000493
Oct3047800481
Nov1018700188
Dec0019082101
Total293736210673013514107