The Vanguard Growth ETF exclusively invests in America's largest growth stocks.The S&P 500 (^GSPC 0.34%) has returned 13.2% so far this year, outpacing its average gain of 10.5% per year since it was established in 1957. However, had you invested in the Vanguard Growth ETF (VUG 0.54%) at the start of this year instead, you'd be sitting on an even better return of 16.3%. This result isn't a one-off, because the exchange-traded fund (ETF) has outperformed the S&P 500 every year since it was established in 200 ...