Replacing a range of numbers

Hi,
I have lines like this(there could be any number):
DELAY : 462

I want to replace all lines with number higher then 200 with 200. So
the line above should looks like this:
DELAY : 200

If I use this replace commnad:
:%s/DELAY : [201-9999]/DELAY : 200/g

it makes this:
from DELAY : 1012
to:   DELAY : 200012

It looks like it replaces only the first digit and keeps the rest. It
also replaces string DELAY : 200, what it should not, because it
should find only numbers from 201.

Can anyone help me?

Thank you in advance

PS: Here is short example of the file:

Mouse : 741 : 490 : LeftButtonUp : 0
DELAY : 725
Mouse : 656 : 450 : LeftButtonDown : 0
DELAY : 87
Mouse : 656 : 450 : LeftButtonUp : 0
DELAY : 1137
Mouse : 588 : 412 : LeftButtonDown : 0
DELAY : 75
Mouse : 588 : 412 : LeftButtonUp : 0
DELAY : 912

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