User blog comment:V3hemenc3/What is the accepted number of farm on an AD carry?/@comment-74.240.78.37-20120918180547

Imo you have the junglers and top laners a little confused. Because the lane offers so much more gold and experience than the jungle, top laners farm the lane and junglers farm kills and build gp5.

Back to the topic, of course you hope for 100% of the minons but the amount of cs expected really fluctates depending on what's going on in the lane. I would say the adc should be able to farm at least 70% of the minions. I think above 70% is a job well done and below 60% is a failure.