The following description was taken from NTC: Carbon Dioxide Emissions Intensity for New Australian Light Vehicles 2019 :

Every year the National Transport Commission reports on the carbon dioxide emissions intensity performance of new passenger and light commercial vehicles sold in Australia, based on annual sales data provided by the Federal Chamber of Automotive Industries (FCAI). This helps inform governments, fleet managers and consumers about Australia’s purchasing trends and the collective impacts of our buying choices on carbon dioxide emissions intensity.

In the last five years, there has been a growing trend towards electric and ‘green’ vehicles, but not at a scale that has materially decreased
overall emissions intensity. Electric vehicle sales rose 149 per cent in 2019 taking the number on Australian roads to 14,500 – out of the nation’s almost 18 million cars and light trucks. Another consumer trend that has changed the fleet mix in Australia since 2011 is the growth in SUVs and pick-up trucks.

This trend away from smaller vehicles has seen a flatlining of emissions intensity levels. In 2019, the overall emissions intensity decreased by 0.2 per cent, the smallest improvement since reporting began in 2002.