Jan ( N = 502 )

Feb ( N = 456 )

Mar ( N = 504 )

Apr ( N = 490 )

May ( N = 497 )

Jun ( N = 482 )

Jul ( N = 499 )

Aug ( N = 502 )

Sep ( N = 488 )

Oct ( N = 499 )

Nov ( N = 486 )

Dec ( N = 506 )