Here are the 2016 returns of some roughly 60/40 portfolios reported by morningstar.com:
Key:
VSMGX Vanguard LifeStrategy Moderate Growth (it is 60/40)
VTWNX Vanguard Target Retirement 2020 (it is 57/43)
VBIAX Vanguard Balanced Index (60/40, has no foreign nor international stocks)
DGSIX DFA Global Allocation I 60/40
VWENX Vanguard Wellington (it is 66/34)
VTTVX Vanguard Target Retirement 2025 (it is 65/35)
Portfolios tilted to small-caps and/or value equities and away from foreign equities have done quite well this year.