Jan ( N = 310 )

Feb ( N = 278 )

Mar ( N = 310 )

Apr ( N = 300 )

May ( N = 289 )

Jun ( N = 277 )

Jul ( N = 310 )

Aug ( N = 310 )

Sep ( N = 297 )

Oct ( N = 310 )

Nov ( N = 247 )

Dec ( N = 310 )