*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00005656
Feb001902342
Mar6042300429
Apr3322869002904
May251563351003532
Jun711272123002321
Jul54634600406
Aug10256500577
Sep0146200463
Oct0041100411
Nov0019800198
Dec00251127153
Total16932410792120611492