Jan ( N = 31 )

Feb ( N = 28 )

Mar ( N = 30 )

Apr ( N = 25 )

May ( N = 576 )

Jun ( N = 715 )

Jul ( N = 726 )

Aug ( N = 669 )

Sep ( N = 603 )

Oct ( N = 740 )

Nov ( N = 720 )

Dec ( N = 722 )