*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003138363867
Feb071356614962865
Mar9262556002591
Apr7752542002624
May205000390005410
Jun707068372007510
Jul4918512758004658
Aug9292673002711
Sep162415002422
Oct011862001863
Nov031513001516
Dec00817833314156
Total165140661925445866342193