*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004629613007
Feb4615181111702709
Mar44624710004816
Apr200995712006011
May4771947318007989
Jun4031543218003775
Jul128261883002037
Aug531313001321
Sep531512001520
Oct001414001414
Nov001268001268
Dec00639120152655
Total12665473050558614638522