The annual return of China's Social Security Fund in the past 12 years stood at 8.4 percent, the fund's vice-chairman told China Wealth Management 50 Forum on Thursday.

"The total scale of the fund has now reached 1 trillion yuan ($160.6 billion), investing in almost all types of financial assets, and the annual return in the past 12 years was 8.4 percent," said Wang Zhongmin, vice-chairman of the National Council for Social Security Fund, China's largest limited partner.

Wang suggested that a CPI index reflecting the cost of living for China's aging population should be compiled.