The unfunded liabilities of U.S. public pensions -- which measures how much more they need to cover all the benefits that have been promised -- are already rising. The obligations stood at $1.95 trillion at the end of June, an increase of $510 billion since the end of 2013, according to the Fed’s figures.

The resulting strain has led to credit-rating cuts to New Jersey, Kentucky and Chicago, which in 2015 was cut to junk by Moody’s Investors Service. Illinois, the lowest-ranked state, has been downgraded twice by S&P since 2013 and three times by Moody’s.

In places like Chicago, where the pensions are short a combined $34 billion, the dwindling returns may diminish efforts to pull them out of the hole.

Mayor Rahm Emanuel last week pushed a plan through the city council to raise water and sewer levies to fund the municipal workers’ pension, its most underfunded. Chicago will now pay about $2 billion more to that pension than previously planned over the next six years.

But that doesn’t take into account the impact if investment performance falls below target. The municipal fund assumes returns of 7.5 percent, while only earning 1.8 percent in the year ended in December, according to actuaries. That’s left it at risk of running out of money, despite the injection of taxpayer money.

“If markets are flat or negative in upcoming years, we will continue to lose principal at a double digit rate,”  Jim Mohler, executive director of the fund, told lawmakers in Chicago on Monday. “The projected insolvency for the fund will escalate.”

This article was provided by Bloomberg News.

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