Last year marked the first increase in fixed-term jobs in several years.
Between the years 2003 and 2005, one-fifth of those working for the government or municipalities had fixed-term contracts.
According to Minister of Labour Tarja Filatov, the growth is partly due to an increase in substituting employees.
She also said that many people do not complain when forced by employers to accept short-term contracts.
"People do not dare to complain even when the situation is clearly illegal," she said. "We should have a more collective complaint process, so that an individual is not labelled as a trouble-maker."
Overall, about 16.5 percent of all employees have such contracts. About 20 percent of women and 13 percent of men have fixed-term contracts.