It's quite difficult to study the Tax Justice Network, because every month it seems to increase by $50 billion. It started at $50 billion, then it was $250 billion, and the nearest figure I've seen is up around $600 billion. It's a number that is continually moving.
We have consciously chosen not to put out such a number, because frankly, I don't think you have the methodology or the data that would enable you to reliably estimate how much we are losing to tax havens.
What we are confident of is that it's big and it's growing. How do we know that? It's by looking back. I'll give you an example. Ireland, a small country—not a low-tax country, but a high-tax country—last year collected €1 billion from Irish residents using Channel Islands offshore havens. That is 26% of the total revenue that they get from unearned income. That's an enormous amount.