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There's strength in numbers.

More than half of the 20 biggest index funds achieved double-digit returns in 2016, too.

Leading the group is Franklin Income Fund, which gained 16.29% by the end of the year. Comparatively, the bond market, as gauged by the iShares Core US Aggregate Bond fund, remained flat in 2016. The large iShares fund had dividends, though, of about $2.40 per share.

Benefiting from investors seeking safe havens, bond funds added $274.4 billion in 2016, while $61.8 billion was withdrawn from stock funds, according to Lipper.

Dominating the list are offerings from American Funds. Its oldest fund — the Investment Company of America fund — is also its best performer.

Also from its growth and income category is its Washington Mutual Investors Fund. Funds from Vanguard, Fidelity and Metropolitan West round out the list.

Scroll through to see the best 2016 returns of the industry’s largest funds. All data from Morningstar.