Yeah. We never given any kind of guidance like that on a longer term basis, but you make a good point in terms of, if you go back and look at the vintage years, when we started opening more and more stores, obviously, when they hit their fourth, fifth, sixth, seventh, eighth years, they come into that pool of needing to replace equipment Another point is that we’ve said in the past that it’s, you don't just, on day one of your four, day one of your five going to replace everything, a-la-carte always an example that's got to replace first. It's usually on a kind of a rolling quarterly basis. We don't shut down stores when we go in and replace equipment, et cetera. So -- and that’s the way it’s been over the last two or three years. But obviously as we continue to open up more stores, there's an overlapping of that too. If you’re replacing some equipment in your fourth or fifth year, but the time you're in your sixth, seventh, eighth year, you’ve got other stores that are in the first part of the cycle of replacing their cardio. What I would say is that, so we ended the year right around 30% of our total equipment revenues were replacement equipment and I've been -- I think at the end of Q3, I'd said it would be coming in the high-20s. So it's pretty close to that, it’s right around 30%. I expect that in 2017 to be right around that or slightly higher, 30 to very low 30% range as re-equipment as a percent of our total, obviously, the dollars are higher. But that is kind of the answer we have right now in terms of that replacement cycle.