Where did the Sweden Democrats get all their extra votes from?

The Sweden Democrat party (SD) grew its vote share in every municipality it already controlled, grew its vote share among blue- and white-collar workers, and overtook Centre as the party of the countryside.

Where did the Sweden Democrats get all their extra votes from?
The Sweden Democrat party (SD) grew its vote share in every municipality it already controlled, grew its vote share among blue- and white-collar workers, and overtook Centre as the party of the countryside.