In reply to Rob Exile Ward:
It's a pretty weak correlation but it certainly doesn't show the opposite.
What is more important is the death rate for those that have it, rather than the rate of catching it, which is a different graph.
It seems that if you catch it and are vitamin D deficient you are much more likely to die.
Its certainly worth supplementing if you aren't pale skinned and pale skinned people should probably try to get outside and expose arms and face for 10 minutes a day. It's not a bad idea to get outside for mental health anyway, so why not.