*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00008181
Feb001512440
Mar03660069
Apr12447600501
May3880281001164
Jun13956210001179
Jul1114345600610
Aug4528300292
Sep0326800271
Oct0016200162
Nov00510051
Dec00290233262
Total322014229713384682