They were followed closely by Lexus Madrid.
The dealership puts the rise down to the introduction of new models, especially the IS 220d.
Richard Vance, centre manager for Lexus Belfast, which is owned by the Charles Hurst Group, said: “Who would expect a dealer in Belfast to outperform their European counterparts?
“It is testament to just how popular Lexus is becoming here and I firmly believe our consistent excellence in customer service plays a vital role in our overall success. Customers are the lifeblood of our business and it is our aim to retain them for life”.
Charles Hurst also represents Lexus, under their parent company brand Lookers in Southend in the South East of England.