Jan ( N = 310 )

Feb ( N = 290 )

Mar ( N = 300 )

Apr ( N = 299 )

May ( N = 310 )

Jun ( N = 300 )

Jul ( N = 296 )

Aug ( N = 286 )

Sep ( N = 300 )

Oct ( N = 310 )

Nov ( N = 239 )

Dec ( N = 302 )