*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003375378
Feb121490144296
Mar0821100219
Apr05640069
May0105600111
Jun05232200545
Jul332633200661
Aug2418000186
Sep0110800109
Oct0110500106
Nov2021700219
Dec10812451535
Total9975147559703434