I feel like the data here should have some way of corrections for both growth in driving population as well as prices of vehicles. Without that, it's difficult

I feel like the data here should have some way of corrections for both growth in driving population as well as prices of vehicles. Without that, it's difficult to tell if this absolute growth in number is of concern, or it's more like movie blockbuster numbers, which keep growing in absolute terms but don't necessarily indicate a higher percentage of people have seen that movie in its theater run.