Jan ( N = 497 )

Feb ( N = 447 )

Mar ( N = 497 )

Apr ( N = 480 )

May ( N = 500 )

Jun ( N = 381 )

Jul ( N = 270 )

Aug ( N = 78 )

Sep ( N = 299 )

Oct ( N = 490 )

Nov ( N = 480 )

Dec ( N = 494 )