Jan ( N = 31 )

Feb ( N = 26 )

Mar ( N = 31 )

Apr ( N = 24 )

May ( N = 29 )

Jun ( N = 29 )

Jul ( N = 26 )

Aug ( N = 29 )

Sep ( N = 23 )

Oct ( N = 31 )

Nov ( N = 20 )

Dec ( N = 29 )