Jan ( N = 501 )

Feb ( N = 439 )

Mar ( N = 499 )

Apr ( N = 487 )

May ( N = 502 )

Jun ( N = 483 )

Jul ( N = 507 )

Aug ( N = 469 )

Sep ( N = 485 )

Oct ( N = 499 )

Nov ( N = 488 )

Dec ( N = 511 )