Jan ( N = 491 )

Feb ( N = 447 )

Mar ( N = 496 )

Apr ( N = 480 )

May ( N = 490 )

Jun ( N = 475 )

Jul ( N = 490 )

Aug ( N = 492 )

Sep ( N = 479 )

Oct ( N = 496 )

Nov ( N = 479 )

Dec ( N = 486 )