I would only say that there's been an explosion of studies over the last 10 years on voting behaviour. Most of it is showing that there is less and less of an obvious link between voting methods and the turnout rate: the turnout rate has gone up and down independent of the electoral systems that have been chosen.
More and more work has been done over the last 10 years on this. They were looking at other factors. The two factors that do seem to be making a difference, as I said in my opening presentation, are mandatory voting and voting on Sunday.