Foreigners accounted for a lower proportion of Luxembourg's population at the start of 2019, after the country brought in reforms to make it easier to gain its nationality.
The percentage of foreign residents dropped by 0.4% over the course of 2018 to reach 47.5% of the population, according to the country's statistics bureau.
Statec put the decrease down to a rise in naturalisations in 2018, with 6,950 residents choosing to gain Luxembourgish nationality.
The statistics office said this was due to different legislative steps, such as allowing minors to gain nationality through one Luxembourgish parent.
The government lowered the bar to gain Luxembourgish nationality in 2017, specifying only five years residency instead of seven and relaxing language requirements.
However, the number of foreign nationals living in Luxembourg rose to 291,500 at the start of 2019 from 288,200 at the beginning of 2018.
Migration
Overall, Luxembourg's population grew to just under 614,000 inhabitants, boosted by immigration. The population increased by 11,889 people to reach 613,894 residents on 1 January.
The jump was mainly due to net migration which stood at 10,659 in 2018, Statec found.
Portuguese immigrants account for the largest group of foreign nationals living in Luxembourg, representing 15.6% of the population. French residents account for 7.6%, followed by Italians on 3.7%, Belgians on 3.3% and Germans on 2.1%.
The average age of the population was 40.2 years for women and 38.7 for men. Foreigners are on average younger than the local population and outnumber Luxembourgers in the 30-to-49 age bracket.