China's fixed-asset investment rose 23.8 percent year-on-year to 30.1933 trillion yuan (4.7736 trillion U.S. dollars) in 2011, the National Bureau of Statistics (NBS) said on Tuesday.

The growth rate was down 0.7 percentage points compared to that in the first 11 months, and remained flat from that of last year, NBS figures showed.

On a monthly basis, fixed-asset investments fell 0.14 percent in December, the NBS said.

In 2011, investment in the primary industry amounted to 679.2 billion yuan, up 25 percent; that in the secondary industry totaled 13.2263 trillion yuan, up 27.3 percent; investment in the tertiary industry rose 21.1 percent to hit 16.2877 trillion yuan.

Investment made by the state-owned and state-controlled enterprises increased 11.1 percent year-on-year to hit 10.7486 trillion yuan last year.

Infrastructure investment, excluding investments in the production and supply of power, gas and water, rose 5.9 percent year-on-year to 5.106 trillion yuan. But the rise was 14.3 percentage points lower than that of last year.

Investment in the nation's western regions grew fastest last year, up 29.2 percent year-on-year, followed by 28.8 percent in the central regions, and 21.3 percent in the eastern regions.

Meanwhile, investment in the nation's property sector rose 27.9 percent year-on-year to 6.174 trillion yuan, down 4.1 percentage points from that in the first three quarters and 5.3 percentage points from last year.