*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003838
Feb00150621
Mar30820085
Apr19669400719
May4791554001610
Jun119221720001861
Jul3491081001124
Aug121109001112
Sep6181800825
Oct0029000290
Nov00610061
Dec001605874
Total22949744001027820