*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan011118553583
Feb152296239480
Mar482662500699
Apr22610157500902
May1828149200755
Jun235135727001097
Jul21690922001228
Aug301444600490
Sep1443000435
Oct0046201463
Nov0016300163
Dec002002756958
Total93945752822615498253