Exchange-traded funds continued to grow in popularity, despite last year's poor market performance, as investors continue to look for ways to cut management fees.

According to TrimTabs, there were 160 new ETFs launched in 2008, compared to 21 new mutual funds. Net inflows to U.S. equity ETFs were $120.8 billion in 2008, versus $162.4 billion in net outflows for U.S. equity mutual funds.

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