*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan23000023
Feb500207
Mar00013013
Apr00173781
May0074825261015
Jun0040102342505313
Jul00293506291008
Aug0031816190
Sep0021378147
Oct00024024
Nov000000
Dec1900080198
Total218082229354268019