*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan57201060
Feb110013024
Mar0011721174
Apr00532029354
May00258112221058
Jun0068282011304018
Jul00367493241109
Aug00841310431
Sep0022534259
Oct00074074
Nov00033033
Dec39510250421
Total4633145568417208015