Jan ( N = 12 )

Feb ( N = 264 )

Mar ( N = 592 )

Apr ( N = 994 )

May ( N = 1449 )

Jun ( N = 1430 )

Jul ( N = 1481 )

Aug ( N = 1485 )

Sep ( N = 1448 )

Oct ( N = 1471 )

Nov ( N = 1175 )

Dec ( N = 818 )