Sgt. Joe, I was using British data, but don't have the actual figures available. It was particularly marked among employees of the National Health Service.
Mike

Yeah vitamin D, that's kinda funny being in Canada. They stopped the testing, just started saying you live here, you're low, take the vitamin D. I don't care what color you are, we don't get enough sunlight to make vitamin D, unless we are already taking some. I was taking 1000 (International units), now I've upped to 3 or 4.
About people of color, often they have lower economic income, hence poor nutrition, access to medical care, and jobs considered essential so more exposed to the virus. Living in more crowded conditions, now seeing news reports where people of color are less likely to want to take the vaccine EVEN when working in health care. I get it, the past was horrible to people of color in medical experiments. As a vet, I know they experimented on us as well, but I'm taking the vaccine. Stay safe

I take a multivitamin that has 20ug of Vitamin D, which is 400% of the UK's NRV.
Back in November, early days, I decided to give a couple of boxes to my 91 year old grandfather because of what I had read on Vitamin D and COVID-19. I also had a small hope that it would help with his vertigo, which had been increasingly serious recently. I thought maybe he needed some minerals that the multivitamin tablet could provide. It must have helped with that too since he has only had 1 (albeit serious) episode of vertigo ever since he started taking them. Other than his vertigo, he is an extremely healthy man for his age.

In summary, supplementation can be useful, even if you eat well.