An image that shows how much non-free software I use on my Linux machine

How RMS are you?

Install vrms and run it.

sudo apt-get install vrms && vrms

This package will analyze the set of currently-installed packages on a Debian-based system, and report all of the packages from the non-free and contrib trees which are currently installed.

I got:

12 non-free packages, 1.0% of 1147 installed packages. 4 contrib packages, 0.3% of 1147 installed packages.