Jan ( N = 277 )

Feb ( N = 251 )

Mar ( N = 278 )

Apr ( N = 269 )

May ( N = 437 )

Jun ( N = 535 )

Jul ( N = 553 )

Aug ( N = 556 )

Sep ( N = 537 )

Oct ( N = 552 )

Nov ( N = 537 )

Dec ( N = 553 )