That can we infer about the additional returns from investing dividends in the SPX over this $5-$year period?

Reinvesting Dividends in the SPX added about a $10\%$ additional total return over this $5-$year period compared to the Index return without dividends.

Reinvesting Dividends in the SPX added about a $5\%$ additional total 'eturn over this $5-$year period compared to the Index return without divide ds$.$ over this $5-$year period compared to the Index retuin with out dividends.

What can we infer about the additional returns from