*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003360856118
Feb552819442021954242
Mar530734172004775
Apr862962924003882
May692703424004186
Jun482803197003759
Jul201282978003207
Aug6942321002394
Sep1031754001767
Oct222064002068
Nov212470002473
Dec101550637825339
Total290638528798591206244210