The Vanguard Group's exchange-traded fund lineup more than doubled in terms of assets under management last year as the mutual fund titan rolled out 18 new ETFs, CBS MarketWatch reports.

Assets under management in Vanguard's proprietary VIPER ETFs grew to $5.9 billion from $2.6 billion since the end of 2003, primarily due to the fact that the VIPERs family grew to 20 from two investments during the same period.

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