*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00015051
Feb001001828
Mar00220022
Apr02230025
May332415400481
Jun201154552001726
Jul2041442300857
Aug162138800425
Sep3121410219
Oct01370038
Nov00260026
Dec00260300326
Total621917187523684224