For a retirement fund I don't care about the 12 month or really even the three year, as that is looking at the gains since the bottom fell out. Most funds looking at such a short period of time especially last three years look great right now. The gains recently are in my opinion, skewed. For long term I would think the ten year is a better way to judge a retirement investment. As you are gonna be invested for 30+ years. Maybe I need to read more. I would think 8-10 percent on long term investment should be achievable.