Finland has a long tradition of adult education, and by the 1980s nearly one million Finns were receiving some kind of instruction each year. Forty percent of them did so for professional reasons. Adult education appeared in a number of forms, such as secondary evening schools, civic and workers' institutes, study centres, vocational course centres, and folk high schools. Study centres allowed groups to follow study plans of their own making, with educational and financial assistance provided by the state. Folk high schools are a distinctly Nordic institution. Originating in Denmark in the 19th century, folk high schools became common throughout the region. Adults of all ages could stay at them for several weeks and take courses in subjects that ranged from handicrafts to economics.