Jan ( N = 276 )

Feb ( N = 250 )

Mar ( N = 275 )

Apr ( N = 268 )

May ( N = 435 )

Jun ( N = 533 )

Jul ( N = 552 )

Aug ( N = 552 )

Sep ( N = 539 )

Oct ( N = 547 )

Nov ( N = 536 )

Dec ( N = 554 )