Certainly. This is a very important driver of total cost, so if you did nothing else and reduced the amount of space you used over a period of time by 15%, you should have a 15% lower cost. On $3 billion a year, that's a very important goal.
So we took a forward look at the leases that are expiring each year and what the opportunity will be. Not all of them will be relocations, as some will be in situ. We have a very detailed plan worked out for what opportunity exists each year, and we are steadily closing in on that opportunity as we go forward. I'll turn to my colleague to elaborate more.
Tim, I believe we have a five-year or longer plan.