Vietnam\'s economic growth has slowed in 2011 after the government took steps to rein in inflation and domestic demand.The statistics office said it expected the economy to have grown by 5.9% this year, down from 6.8% in 2010.Vietnam has raised the cost of borrowing and introduced measures to cut credit growth in a bid to control prices. However, despite those measures the rate of inflation doubled to 18.6% in 2011 from 9.2% a year ago.