Jan ( N = 497 )
Feb ( N = 438 )
Mar ( N = 408 )
Apr ( N = 400 )
May ( N = 518 )
Jun ( N = 500 )
Jul ( N = 538 )
Aug ( N = 408 )
Sep ( N = 477 )
Oct ( N = 491 )
Nov ( N = 392 )
Dec ( N = 120 )