Jan ( N = 16 )

Feb ( N = 14 )

Mar ( N = 13 )

Apr ( N = 9 )

May ( N = 18 )

Jun ( N = 15 )

Jul ( N = 11 )

Aug ( N = 11 )

Sep ( N = 11 )

Oct ( N = 13 )

Nov ( N = 13 )

Dec ( N = 13 )