*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00156975
Feb003602056
Mar10830084
Apr0439500399
May1712166000798
Jun6716249800727
Jul501621900285
Aug7627700290
Sep0128000281
Oct1127500277
Nov0016400164
Dec00300361391
Total143311291854503827