*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0001620712087
Feb0071637021421
Mar011362001363
Apr631396001405
May5321998002035
Jun202552659002934
Jul13501656001719
Aug4161177001197
Sep3592400932
Oct0072000720
Nov0066100661
Dec00427416352066
Total513621369623440818540