Jan ( N = 499 )

Feb ( N = 456 )

Mar ( N = 504 )

Apr ( N = 486 )

May ( N = 441 )

Jun ( N = 463 )

Jul ( N = 509 )

Aug ( N = 507 )

Sep ( N = 482 )

Oct ( N = 501 )

Nov ( N = 487 )

Dec ( N = 500 )