*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0005957962
Feb002393340582
Mar110156400666
Apr44844300495
May141061791001866
Jun2329791195004197
Jul817191668003395
Aug1191759001779
Sep021262001264
Oct0084300843
Nov0049000490
Dec0021329891204
Total515929946710228617743