*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0019843853
Feb125214361889
Mar0201400001420
Apr6581317001381
May294271286004586
Jun91191245970019812
Jul4424791474003997
Aug10963900658
Sep0255800560
Oct0055900559
Nov0049000490
Dec0018909281117
Total18125965803113213236322