Why are there so few Catholic black people?

I have been a priest for about 12 years now. I've had very few darkies in my congregations over the years (even though there's a lot of them in the community). Recently, a young black person came into the church and asked what it would take to convert. Because I didn't know how to talk to one of his kind, I told him that black people weren't allowed to be Catholics. When he asked why, I said it was because eating KFC was considered a sin, so he went away. But it did get me thinking to why more black people aren't Catholics (and no racist answers like "the collection plate money would be stolen by black people". Seriously racist people suck)