This is fascinating. If you look at the tax expenditure lines from 2005 to 2011 as they're published by your government, and then jump onto David Foot's website and take a look, you'll see that David has a demographic bubble transition—this year, this year, this year, and this year. Right now we actually should have a dramatic interest in charitable giving, because we're going through a baby boomer period: their kids are finished university; they have disposable income; they still have traditions of giving, and so on. But that will come to an end. So I am quite fearful about this matter. To my knowledge, nobody has done research to overlay the charitable tax expenditures with the demographic bubble shifting giving. That still needs to be done to help answer your question.
Now the window is open. Now we can do it, right?