*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00043370413
Feb001347111252
Mar6422600236
Apr14824000289
May91294362001665
Jun403385382003807
Jul281420283001731
Aug32925500287
Sep0527000275
Oct0019200192
Nov0014600146
Dec00113911971319
Total876185260359167810612