Jan ( N = 42 )

Feb ( N = 145 )

Mar ( N = 248 )

Apr ( N = 386 )

May ( N = 405 )

Jun ( N = 480 )

Jul ( N = 491 )

Aug ( N = 495 )

Sep ( N = 479 )

Oct ( N = 495 )

Nov ( N = 343 )

Dec ( N = 110 )