we are waiting 15000$ above by ending of the this 2017,
Already bitcoin reached $18000.Now we are waiting 20000$ above by ending of the this 2017, 
I don't know when the time come in this year that bitcoin will grow $20000.although I do not know if it is either.Yet Waiting to see.
$18000?? Where did you see that?? As far as I know its around $16400 on preev and will take time to achieve the price of $18000 and likely by the end of the year.