Windows (Phone) Store Developers: What's your downloads to ratings ratio?

I've been trying to estimate apps' amounts of downloads using the amount of ratings they have, and I think at least a little data would be useful to make it more accurate.

So if you developer folk could leave some info below in this format, that would be awesome:

Type: [free or paid]
Ratio: [amount of ratings/ amount of downloads]

For example:

Type: Paid
Ratio: 1/10

Thanks guys