Cover Letter Help - include or don't include percentages?

[Mags]

I'm working on a cover letter and I'm debating whether or not I should quantify the following information:

- in two months I raised Facebook likes for my company to 166 (an increase of 1,975%)
- I increased Facebook group membership from 50 to 300 (an increase of 600%)

Obviously the actual numerical increases are a bit on the small side (it's a small company targeting a niche market, so it's fairly good for what the company is), but I feel like if I put the huge percentages that might call for some awkward questions in the interview itself (provided I get it). Any thoughts on how to present (or maybe avoid presenting) this information?