How often do you upgrade your CAD Workstations?

I'm sure I remember seeing a way of posting a "voting poll". Would be a nice way to handle this thread, but can't figure out how so will just post it as a normal thread.

How often does your company upgrade of replace the CAD Workstations?

1.     Every year.

2.     Every two years.

3.     Every three years.

4.     Every four years.

5.     Every five years.

6.     More than five years.

7.     Never

Cheers.

SolidworksAdministration