Over the past 33 days I've made 31 posts (including today). That's a 93.939393 completion percentage.
If I assign numerical grades to each day, I'll have 31 days with scores of 100, and 2 days with scores of 0. That works out to an average numerical grade of 93.939393.
When I grade my own posts, it's not the quantity of words that counts, but rather the quality.