One that I would speak to we've already referenced, but it's an important one that bears repeating. That's in relation to exchange of information. We've had exchange of information provisions in our treaties for a very, very long time, but they were only on request and they were not covering some of the often-labelled offshore financial centres. We didn't have treaties with those jurisdictions. We didn't have any other way to gather information from those other jurisdictions. About 10 or 12 years ago, there was the advent of the tax information exchange agreements where, notwithstanding the absence of a comprehensive tax treaty, we engaged in and the rest of the world engaged in negotiations to put in these so-called TIEAs, tax information exchange agreements, with those countries. That was a very important development, but it was still information on request, meaning you had to have some sense of there being a particular taxpayer who had an investment in a particular place to know to ask the question, which had its own limits.
More recently, sort of following the U.S. FATCA legislation, which has its own issues particularly because of U.S. citizenship taxation, the OECD and G20 developed this common reporting standard for the automatic exchange of information. We've had the automatic exchange of information with a number of countries, maybe 20-some countries, for the past several years, but the standardized approach for a broader range of countries has been very important. Although the treaty language itself hasn't had to change to authorize this, it has been a very important development.