Jan ( N = 31 )

Feb ( N = 316 )

Mar ( N = 1209 )

Apr ( N = 1170 )

May ( N = 1202 )

Jun ( N = 1170 )

Jul ( N = 1195 )

Aug ( N = 1207 )

Sep ( N = 1168 )

Oct ( N = 1208 )

Nov ( N = 1170 )

Dec ( N = 1208 )