Those returns are AFTER expenses and taxes, at the highest rate, have been removed.  It has a 20% total return lead.  You do not need to subtract expenses from published returns.  They have already been removed.  Facts are facts.  Theory is theory.

TWEIX returned $23,133 over the last 10 years before taxes and after expenses.  VIVAX $16,229.  Even if there was no change in NAV and the entire earnings of $13,000 was taxable, it's still more money than $6000. 

Herman