Certainly there are other contributions from the industry. To take the Zambia example, most of the taxes that the copper mining industry in Zambia contributes are basically the pension contributions of workers that the companies collect on behalf of the government. So it's really the employer's own taxes, not revenues that the company is paying to Zambia.
It's true that obviously the industry structure is different among oil, gas, and mining. But we've been working in Guinea, as I think I mentioned, and we estimate that as a result of changes in Guinea's iron ore royalty structure—which moves it into the range of the broad international standards and not the high end—it's probably going to generate $3 billion a year more for Guinea by 2017. That's just for iron ore. That's a lot of revenue that Guinea didn't have before. That can make an enormous difference in that government's ability to provide social services, but to make sure the money actually goes for that.... At least it has the first element, which is a revenue stream, and that comes from, as I say, a rebalancing of the terms of the transactions between them and the mining companies.