The entrance of new brands, particularly from China, had helped keep the market competitive, Stronach said.
But although buyers had more makes and models to choose from than ever before, he said the overall rate of new vehicle sales was still well behind that of Australia and the United States, which sell new vehicles at double the rate of this country.
The MTA said new car sales were dominated by Toyota, with the Japanese firm's new Corolla model helping propel the brand's sales to 21,620 units in 2012, giving it a 21 per cent share of the market. Ford was in second place with sales of 11,132 units, giving it an 11 per cent market share, while third place went to Holden with sales of 9,446 units and a 9 per cent share.
Used car sales were down 3 per cent on 2011 at 78,311 units last year, but this was ahead of expectations.
Stronach said the used car market had been affected by new exhaust emissions standards, which had reduced the available pool of vehicles that could be imported from Japan.