Step 1: Find your official post count on your profile.

remember that number.
Step 2: click the "Search Posts" link.

Step 3: Find out how many posts you've really made. That number is circled here;

Now, divide your official post count by your actual post count (your official post count will be smaller and you will get a decimal result). I got .70, which means I am (or my posting activity is) 70% on-topic.
Show us your results!
