The growth rate of China's gross domestic product (GDP) in 2009 has been modified up to 9.2 percent from the previous 9.1 percent, the National Bureau of Statistics (NBS) announced Tuesday.

After the revision, China's GDP at current value was 34.0903 trillion yuan (5.15 trillion U.S. dollars) in 2009, up by 39.6 billion yuan from the previous figure, the NBS said in a statement on its website.

The NBS gave no explanation for the revision, but a chart breaking down the output figures indicated all the additional gains came from the tertiary, or service, sector.

After the verification, the value added output of the tertiary sector was 14.8038 trillion yuan, 39.6 billion yuan more than the figure announced by the NBS in July.

The value added output of the primary sector was 3.5226 trillion yuan while that of the secondary sector was 15.7639 trillion yuan, both unchanged from previous calculations.

This was the second revision of the 2009 GDP growth figure. The Chinese government originally said the national economy expanded 8.7 percent year on year in 2009.

Based on the current calculation, the primary sector contributed 10.3 percent of China's 2009 GDP, the secondary sector 46.3 percent and the tertiary sector 43.4 percent.

On Jan. 20, the NBS is scheduled to release China's GDP growth figures for the fourth quarter and the whole of last year. (1 yuan = 6.6216 U.S. dollars)