The Abu Dhabi Investment Authority has warned the the global economy still faces an uncertain future.

In its first annual review, the world's largest sovereign wealth fund has said the economic outlook will be dominated by exit strategies.

The fund, which has rarely given details of its investment strategy, is said to have returned 6.5 percent on an annualized basis, over a 20-year period up to the end of 2009.

46 percent of the fund's portfolio in 2009 was allocated to equities, with government bonds forming at least 10 percent of its portfolio.

In January, ADIA said it still saw big risks in the global economy with slower recovery expected in developed markets.