what is the best returning index for 1997

The S&P 500 (GSPC) had the highest return in 1997 by a major index, returning 31%.

ASSETYEAR% RETURN
the S&P 500 (GSPC)
1997
31.01%
the Dow Jones Industrial Average (DJI)
1997
22.64%
the Nasdaq Composite (IXIC)
1997
21.48%