It is important to consider total compensation and not just cash wages. I'm assuming when you say "wage stagnation" you are referring to cash wages. Here is some data that includes total compensation: http://www.pewresearch.org/fact-tank/2018/08/07/for-most-us-...

    According to BLS-generated compensation cost indices, 
    total benefit costs for all civilian workers have risen 
    an inflation-adjusted 22.5% since 2001 (when the data  
    series began), versus 5.3% for wage and salary costs.