We commission a fair bit of research. We are commissioning research for the last election to see why. We all know “what” happened to the turnout, but not the “why”. Time after time, those surveys suggest that maybe 8% of non-voters would attribute the fact that they did not vote to some administrative reasons: they're too busy, they have conflicting schedules--such things as that. Beyond that, there's a wide range of factors that involve engagement in political life. Sometimes there's some cynicism, but that's not.... Basically, it's lack of information. More and more electors are not relying on the mainstream media; they get their information from various alternative sources.
Anyway, it's a challenge, and as part of the evaluation, there will be some discussion about voter turnout phenomena. You can expect further research in the coming year.