Jan ( N = 618 )

Feb ( N = 560 )

Mar ( N = 620 )

Apr ( N = 601 )

May ( N = 620 )

Jun ( N = 580 )

Jul ( N = 610 )

Aug ( N = 617 )

Sep ( N = 600 )

Oct ( N = 615 )

Nov ( N = 600 )

Dec ( N = 619 )