*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0240106112
Feb002212447
Mar38155900112
Apr1043726500406
May1222355500700
Jun11748940001105
Jul702059000680
Aug17741800442
Sep0020400204
Oct00560056
Nov00360036
Dec10330403437
Total469152318215334337