A total of 87,346 new cars were licensed in the first half of the year
New figures from the Central Statistics Office (CSO) show there has been a massive surge in used cars being sold.
In the first half of 2017, a total of 87,346 new private cars were licensed - a decrease of 10.4% compared with the same period last year.
But the number of used cars licensed rose by 46% compared with the same period in 2016.
In June 2017, 3,585 new private cars were licensed for the first time - a decrease of 13.5% compared with June 2016 - and a total of 7,085 use cars were licensed, an increase of 29.8%.
Volkswagen was the most popular make of new cars licensed here, at 9,089.
This was followed by Toyota (8,580), Ford (8,162), Hyundai (8,023) and Nissan (7,373).
Together these five makes represent 47.2% of all new private cars licensed.
In the first half of 2017, almost two-thirds of new cars licensed were diesel, with 30.6% petrol and 3.7% electric/hybrid.
There was also a 23.2% decrease in the number of new goods vehicles licensed in June 2017 - bringing the total to 1,564.
While the total number of new vehicles licensed during June was 5,856, compared with 7,018 during the same month in 2016 - a decrease of 16.6%.