Jan ( N = 525 )

Feb ( N = 491 )

Mar ( N = 523 )

Apr ( N = 509 )

May ( N = 527 )

Jun ( N = 510 )

Jul ( N = 523 )

Aug ( N = 523 )

Sep ( N = 508 )

Oct ( N = 527 )

Nov ( N = 509 )

Dec ( N = 534 )