Super Fund average performance for 2017

According to The Financial Review today, the average Super Fund performance was a 'great' 10.5%.  I looked at the charts for ASX20, ASX50, ASX100, ASX200 and when I got to ASX300, it shows that it is the ASX300 which outperformed.

Yet most super funds are heavily invested in the big stocks.  Hence only those which invested in the low end of town would have significant alpha.  Perhaps, the super fund index is calculated with income included which is not shown in the index charts.