*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003838
Feb011101224
Mar00260026
Apr10131126001149
May1582191226001603
Jun115691044001228
Jul4922651628002385
Aug733481900926
Sep31438000415
Oct2153400537
Nov1018000181
Dec002207193
Total882606699601218605