Median super growth fund returns estimated 15.5pc in 2012/13 WORKERS are due for a pleasant surprise when they open their end-of-year superannuation statements, with the median balance tipped to have grown by 15.5 per cent during the past financial year. According to super research house Chant West, 15.5 per cent growth will mark the fourth consecutive year of positive returns and the second-best gains in 16 years.