*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan000011
Feb012014
Mar113580072
Apr222741786002082
May346813103003530
Jun4131463283003842
Jul831473203004081
Aug199322795003026
Sep36131458001507
Oct3016800171
Nov00160016
Dec003047
Total2061397158750618339