*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00002424
Feb004026
Mar00770077
Apr511070001076
May2472177002208
Jun5532644002702
Jul1821754001774
Aug601154001160
Sep1065700658
Oct0020800208
Nov00570057
Dec001304861
Total10913981507410011