So says Steven Malanga for RealClearMarkets, here:
From 2001 through 2010, the number of government workers or their beneficiaries receiving pensions from state and municipal funds soared by 2.3 million, or 38 percent, to 8.25 million. During that time, total government workers active in pension funds increased by just 5 percent. As a result, the ratio of public employees still working to those retired fell by a full half worker during the decade, from 2.3 to 1.8. The outflow of money from funds soared, doubling from $100 billion paid to beneficiaries in 2001 to $200 billion in 2010 (the latest year comprehensive statistics are available). ...
Since we haven't set aside enough money to fund these beneficiaries, the massive outflows of funds are troubling. In 2001, governments and workers contributed $65 billion toward pensions while $112 billion went out the door, counting not only payments to beneficiaries but other kinds of withdrawals too. In 2010, workers and government contributed $125 billion to the funds, thanks largely to a sharp increase in contributions from governments (that is, taxpayers), but $213 billion exited the funds.