This FACT indicates the proportion of new motor vehicle sales (not including motorbikes) that occured in 2017 per 100,000 people. While this can be deemed a burden in terms of the negative environmental impact, it is also an indicator of economic prosperity, and is therefore sorted from high to low.
The state/territory with the highest number of new car sales is Victoria, 5725.7 per 100,000 people. The state with the lowest is Tasmania with 3902.4 per 100,000 people. This is a rather predictable result since Hobart is the city with one of the lowest median household annual income.