*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004911915
Feb003470365712
Mar181123001132
Apr1451869001915
May26591907001992
Jun1471131697001957
Jul180181261001459
Aug7113988001072
Sep15495000969
Oct3065000653
Nov1054400545
Dec00214111081323
Total445260115505238414644