Jan ( N = 246 )

Feb ( N = 221 )

Mar ( N = 235 )

Apr ( N = 122 )

May ( N = 109 )

Jun ( N = 180 )

Jul ( N = 202 )

Aug ( N = 216 )

Sep ( N = 51 )

May ( N = None )

Jun ( N = 19 )

Jul ( N = 146 )

Aug ( N = 218 )

Sep ( N = 233 )

Oct ( N = 235 )

Nov ( N = 229 )

Dec ( N = 247 )