The U.S., the U.K. and Australia, three G20 partners, have developed similar systems, but I think it's important to note that it is a bit like apples to oranges. Every country has a slightly different regime.
The U.S. has spent $5 billion over 17 years, the U.K. has spent $1.7 billion over six years and Australia has spent $800 million over 14 years to develop equivalent systems. We have an international benchmarking report that we're including in the package that we'll submit to the committee to inform your study.