Jan ( N = 309 )

Feb ( N = 279 )

Mar ( N = 201 )

Apr ( N = 300 )

May ( N = 309 )

Jun ( N = 300 )

Jul ( N = 310 )

Aug ( N = 309 )

Sep ( N = 300 )

Oct ( N = 310 )

Nov ( N = 299 )

Dec ( N = 310 )