*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004908912
Feb003450363708
Mar181122001131
Apr1451869001915
May26591907001992
Jun1471131696001956
Jul180181260001458
Aug7113983001067
Sep15495000969
Oct3065000653
Nov1054000541
Dec00213111071321
Total445260115355237814623