Health Care Premiums Have Grown 6% Per Year Since 2013

I've mentioned before that Obamacare premiums started out too low in their first year, which explains (a) why so many insurers have had trouble making money in the exchanges, and (b) why premiums increased so much this year. But maybe a chart will make this clearer....
http://www.motherjones.com/kevin-drum/2016/10/health-care-premiums-have-grown-6-year-2013