Jan ( N = 540 )

Feb ( N = 486 )

Mar ( N = 485 )

Apr ( N = 431 )

May ( N = 539 )

Jun ( N = 534 )

Jul ( N = 554 )

Aug ( N = 552 )

Sep ( N = 538 )

Oct ( N = 551 )

Nov ( N = 538 )

Dec ( N = 547 )