Jan ( N = 20 )

Feb ( N = 25 )

Mar ( N = 19 )

Apr ( N = 21 )

May ( N = 15 )

Jun ( N = 10 )

Jul ( N = 26 )

Aug ( N = 29 )

Sep ( N = 28 )

Oct ( N = 28 )

Nov ( N = 13 )

Dec ( N = 18 )