Jan ( N = 42 )

Feb ( N = 144 )

Mar ( N = 248 )

Apr ( N = 386 )

May ( N = 404 )

Jun ( N = 480 )

Jul ( N = 493 )

Aug ( N = 496 )

Sep ( N = 480 )

Oct ( N = 495 )

Nov ( N = 345 )

Dec ( N = 110 )