Jan ( N = 512 )

Feb ( N = 537 )

Mar ( N = 648 )

Apr ( N = 746 )

May ( N = 801 )

Jun ( N = 750 )

Jul ( N = 837 )

Aug ( N = 782 )

Sep ( N = 604 )

Oct ( N = 595 )

Nov ( N = 500 )

Dec ( N = 511 )