The population of the Netherlands will continue to grow in the coming years but less quickly than of late, national statistics agency CBS said on Friday.

The population will hit 18 million next year and then 19 million by 2037, if current patterns continue, the CBS said. The growth will be largely down to immigration, but longer life expectancy will also have an impact. By 2040, some 25% of the population will be over the age of 65.

The population is likely to have expanded by 140,000 this year, but will settle to around 70,000 per year from 2028 as immigration slows and more people leave, the agency said. From 2028 the CBS expects around 310,000 people a year will move to the Netherlands and 240,000 will go.

By the end of this year, the Netherlands will have 2.9 million residents who were born abroad and 2.1 million of the rest have at least one parent born in another country. That means some 28% of the population have foreign roots of some sort. By 2035, that will have gone up to 33%, the CBS said.