401k rate of return and max contribution amount in 2018

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This year's stock market is bullish! even though it is not as much as cryptocurrency market.
my portfolio of 401 K have a big portion as stocks in domestic and international.

I would like to reveal my 401K rate of return.
My rate of return of 401 K is a little over 18%, which is much better than last year and what I expected.

and in 2018, maximum contribution amount will be increased to 18,500.
So, I just finished to adjust the amount of 2018's contribution amount.

What about you?
How was your investment in 401K ?
and have you set up the new contribution for 2018?

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