E-Trade Financial Corp. announced Wednesday that average trading volume declined significantly in August.

The New York company said that volume fell 36% from a year earlier and 4.6% from July.

E-Trade said it added 24,927 U.S. brokerage accounts last month to increase its customer base to nearly 2.7 million. In August 2009, it added 29,985 accounts.

Total customer assets increased 5.2% from a year earlier, to $146.6 billion, but were down 3.6% from July.

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