Are there any statistic research on peoples' use (count) of each character in the alphabet?

I plan to program a creative word processor that I intend to deploy as a web application.

The central feature in this word processor will be based on statistic research (if I can find any) that has been gathered about peoples’ use of each particular letter in the alphabet (from A–Z). That is, statistics on each character’s general frequency, or use-percentage (“A: 6%”, “B: 3.3%”, “C: 1.8%” and so on) in ‘common’ language.

It doesn’t matter which group of people the research was focusing on, I just need some numbers to go with right now.

I’m initially interested in latin-based languages (English in particular) but other stats (latin or not) would be great too.

So, is anyone aware of such linguistic research?

I’m very thankful for any help!