Whoa! That is low compared to what they were getting last week at 21mh/s.
There was a chart showing the dates of each epoch and what mh/s the 4gb should still be getting until they hit those target dates. Just like the one which just past on the 24th.
I am still able to mine with my lone 4gb card at 21.5mh/s but it was at 31.5mh/s a month ago.
So the hashrate has been dropping off very rapidly every week.