Jan ( N = 504 )

Feb ( N = 469 )

Mar ( N = 503 )

Apr ( N = 487 )

May ( N = 506 )

Jun ( N = 486 )

Jul ( N = 499 )

Aug ( N = 502 )

Sep ( N = 486 )

Oct ( N = 502 )

Nov ( N = 485 )

Dec ( N = 497 )