Jan ( N = 8 )

Feb ( N = 28 )

Mar ( N = 326 )

Apr ( N = 420 )

May ( N = 434 )

Jun ( N = 413 )

Jul ( N = 432 )

Aug ( N = 418 )

Sep ( N = 406 )

Oct ( N = 368 )

Nov ( N = 393 )

Dec ( N = 433 )