I think it's a central challenge for all democracies that fewer and fewer voters are showing up. You're right in that with the initial election there was a lot of excitement, a lot of information about a new system, and there were many voters casting a vote for the first time in their lives that actually counted for something. There was quite a lot of excitement about that. In two of the elections where the turnout was low, it would be twofold. One, I think it would have been lower under first past the post if we kept on seeing the same results that had been there previously, but also in both the elections where it was lower, it was a first-term government going for its re-election. Two, they were both reasonably popular governments, so there was an expectation that they were going to win the election. The second party was almost 20% behind in the polls from the first party. I guess that motivation wasn't quite as strong, whereas in closer elections, where there was only a 2% gap between the two bigger parties, there was a higher turnout.
On October 19th, 2016. See this statement in context.