Health care mutual funds have outpaced the broad stock market in the past 15 years, with the pace of outperformance picking up in the past two years. A $10,000 investment in the average health care fund on June 30, 1999, would have ballooned to $43,820 by Sept. 24, 2014, according to Morningstar Inc. data. The same investment in the S&P 500, a proxy for the stock market, would have grown to $19,387.