*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00013872885
Feb012150290506
Mar02181000831
Apr3532292002348
May151073201003323
Jun222943921004237
Jul17731700001790
Aug981341001358
Sep371629001639
Oct111126001128
Nov0062300623
Dec00319211411462
Total705651717715230320130