Jan ( N = 274 )

Feb ( N = 215 )

Mar ( N = 239 )

Apr ( N = 266 )

May ( N = 433 )

Jun ( N = 531 )

Jul ( N = 552 )

Aug ( N = 550 )

Sep ( N = 529 )

Oct ( N = 550 )

Nov ( N = 529 )

Dec ( N = 551 )