*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00007676
Feb001512238
Mar03590062
Apr12440200427
May3739281001023
Jun12819207001038
Jul118342200516
Aug4321600223
Sep0320100204
Oct0012600126
Nov00400040
Dec00250220245
Total311674199413184018