State retirement systems increased their holdings by 10.7 percent in 2010, according to the U.S. Census Bureau. They had $2.2 trillion in cash and investment holdings, an increase of $213.9 billion from 2009. This followed a $610.8 billion loss the previous year.

In 2010, investment earnings were $289.6 billion, up from a loss of $511.5 billion in 2009. This is the first year of investment gains since 2007, when earnings totaled $402.3 billion. Investment earnings for 2010 were $112.7 billion below the 2007 level.

These statistics come from the 2010 Annual Survey of Public-Employee Retirement Systems: State-Administered Pensions, which reports the annual membership information and financial activity for the nation's 222 state-administered public-employee retirement systems, including cash and security investments holdings, receipts, and payments.