Jan ( N = 505 )

Feb ( N = 438 )

Mar ( N = 501 )

Apr ( N = 495 )

May ( N = 510 )

Jun ( N = 491 )

Jul ( N = 511 )

Aug ( N = 436 )

Sep ( N = 489 )

Oct ( N = 507 )

Nov ( N = 491 )

Dec ( N = 506 )