Jan ( N = 497 )

Feb ( N = 446 )

Mar ( N = 498 )

Apr ( N = 478 )

May ( N = 500 )

Jun ( N = 381 )

Jul ( N = 272 )

Aug ( N = 78 )

Sep ( N = 299 )

Oct ( N = 489 )

Nov ( N = 477 )

Dec ( N = 488 )