*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0002519331958
Feb1272577881523
Mar481217001229
Apr3161090001109
May105683172005865
Jun59134923490013900
Jul3945442602007185
Aug14292092002135
Sep161750001757
Oct001255001255
Nov0184400845
Dec00449218222273
Total131237811254534454341034