words usage database?

Is there any free database/place out there with commonality/usa开发者_Python百科ge ratios of English words? (British or U.S. English, doesn't matter)

I don't care about the exact numbers, only relative to eachother. Something like:

the | 0.2

car | 0.08

chroma | 0.005

overspread | 0.0000007

Edit:

I have found http://en.wiktionary.org/wiki/Wiktionary%3aFrequency_lists which I can scrape for data. However I would prefer an sql-format which is easier to work with.

The term you want to google is "word frequency". One of the top hits is http://www.wordfrequency.info/