Twelve countries have a public pension benefit guarantee insurance plan. This is a crown agency to which corporations that have pension funds are obliged to pay premiums. It is an insurance plan, such that if a corporation were to become bankrupt and there's a deficit in the pension plan, then those crown insurance organizations, such as the U.S. Pension Benefit Guaranty Corporation, will accept the pension fund and will continue to pay the pension income to the participants in the plan.
On March 25th, 2010. See this statement in context.