That's not the only metric, but in terms of stability of voters going.... It's suggested that if we go to a proportional system, we're going to have to vote again and again and that governments will fall all the time. In terms of the voter experience, you cast a ballot for a set of policies that you hope for, and some of them end up in opposition and some of them end up in government. We go on. There is no great instability in terms of the voters' experience and having to go to the polls over and over again. In fact, in the developed world's experience, according to the OECD, which I trust, under proportional systems there has been slightly more stability.
On August 30th, 2016. See this statement in context.