Companies’ health care costs in 2015 rose at the lowest rate in at least 20 years, a report out Thursday shows, but workers’ share of costs continue to skyrocket.

The average health care rate increase for mid-sized and large companies was 3.2% this year, the lowest since the consulting firm Aon started tracking it in 1996.  Despite this, the average amount workers have to contribute toward their health care is up more than 134% over the past decade and that trend will accelerate.

“Our clients say, ‘I can’t keep paying more and more of these ever-rising health costs,’ ” says Craig Dolezal, a senior vice president of Aon’s health practice.

Employees on average contributed $2,490 toward premiums and another $2,208 in out-of-pocket costs, such as copayments, coinsurance and deductibles in 2015, the report shows. The amount of employees’ premium and out-of-pocket costs combined was just $2,001 in 2005.

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Jeffrey R. Ungvary President