Jan ( N = 496 )

Feb ( N = 450 )

Mar ( N = 495 )

Apr ( N = 480 )

May ( N = 464 )

Jun ( N = 477 )

Jul ( N = 491 )

Aug ( N = 491 )

Sep ( N = 480 )

Oct ( N = 494 )

Nov ( N = 479 )

Dec ( N = 496 )