Different types of funds, different investment time and different stock market conditions have different returns. So there is no so-called "average".

For example, in 2006-07, the stock fund made a fixed investment, and the yield exceeded100%; In 2008, the same fund made a fixed investment, and the income was negative, which means that even the principal was lost; Since 2009, I have invested in the same fund, and the income has exceeded 50%.