Jan ( N = 84 )

Feb ( N = 91 )

Mar ( N = 235 )

Apr ( N = 172 )

May ( N = 231 )

Jun ( N = 198 )

Jul ( N = 226 )

Aug ( N = 209 )

Sep ( N = 228 )

Oct ( N = 231 )

Nov ( N = 235 )

Dec ( N = 247 )