Residents of Zeeland earn the worst returns on their stock exchange investments in the country – just 4.1%, according to research by SNS Fundcoach.

The most successful investors are those in the province of Noord-Holland (which includes Amsterdam), who booked an average return of 10.4%. But the best performing investors of all are Volvo drivers, with a return of 12%, SNS Fundcoach said. Citroën drivers were the worst.