Do Unionized workers get paid more?

Check out this site:
http://www.laborresearch.org/charts.php?id=34

It appears that union workers earn more than non-union, but then again
while this is supposedly from the US Bureau of Labor Stats, it's on a
pro-union website, so it could be biased.  In my experience, actually,
the opposite is true.

It varies with the individual and the union. Non-union members are
able to negotiate their individual pay. Union workers pay dues to the
union and the union negotiates 'group pay structures.'

In other words, it depends. I know this isn't the answer you're
seeking. Perhaps you could be more specific. The current shift is away
from unions.