Jan ( N = 480 )

Feb ( N = 432 )

Mar ( N = 496 )

Apr ( N = 480 )

May ( N = 496 )

Jun ( N = 480 )

Jul ( N = 496 )

Aug ( N = 497 )

Sep ( N = 460 )

Oct ( N = 496 )

Nov ( N = 480 )

Dec ( N = 496 )