Jan ( N = 400 )

Feb ( N = 384 )

Mar ( N = 422 )

Apr ( N = 408 )

May ( N = 433 )

Jun ( N = 418 )

Jul ( N = 433 )

Aug ( N = 428 )

Sep ( N = 419 )

Oct ( N = 434 )

Nov ( N = 375 )

Dec ( N = 411 )