There are still very few non whites that go, I can only think of two I've seen regularly walking to or in the ground.
I think racism at the ground is very much seen as taboo by all, I remember the monkey chants and trigger trigger trigger up till I was about 16. I think it was killed off pretty quickly when the Premiership started (at Carrow Rd anyway) as I recall.
Agreed, I don't see many non-white spectators at matches here. I've been to games in London, Liverpool and Manchester, for example and have never witnessed this kind of abuse at all...hopefully never, whether directed at me, other fans, players, Norwich City or opposition.