Jan ( N = 30 )

Feb ( N = 28 )

Mar ( N = 28 )

Apr ( N = 387 )

May ( N = 447 )

Jun ( N = 433 )

Jul ( N = 449 )

Aug ( N = 456 )

Sep ( N = 430 )

Oct ( N = 438 )

Nov ( N = 434 )

Dec ( N = 447 )