Britain’s job market is thriving, and unemployment is at its lowest level since 1975. But this is, technically, only the beginning of the “Brexit” era. The full effects of the country’s increasingly contentious divorce from the European Union are still in the distance.

Data released by Britain’s Office for National Statistics lay bare potential trouble spots. There has been little real growth in wages. The labor market is heavily reliant on foreign workers, who are jittery about their place in Britain after it leaves the European Union. Some are not waiting for the outcome and are seeking to return home.

The recruitment agency Reed says that some businesses questioned in a recent survey of 450 companies said the number of job applicants from European Union nations had fallen since the referendum. The story is told in numbers published by the Office for National Statistics and Reed on Wednesday:

4.7 percent

The British unemployment rate in the three months leading up to and including February, the lowest percentage since 1975.

11 percent

Or 3.4 million: the proportion of workers in 2016 who were not British nationals.

7 percent

Or 2.2 million: the estimated number of workers in the 30.3 million-strong British labor force who come from other countries in the European Union.

“Today’s analysis shows the significant impact international migration has on the U.K. labor market. It is particularly important to the wholesale and retail, hospitality, and public administration and health sectors, which employ around 1.5 million non-U. K. nationals.” — Anna Bodey, a migration analyst for the Office for National Statistics

37 percent

The proportion of non-British workers who are overqualified for their jobs, compared with 15 percent of British citizens.