Jan ( N = 507 )

Feb ( N = 458 )

Mar ( N = 504 )

Apr ( N = 488 )

May ( N = 503 )

Jun ( N = 489 )

Jul ( N = 502 )

Aug ( N = 505 )

Sep ( N = 485 )

Oct ( N = 500 )

Nov ( N = 485 )

Dec ( N = 498 )