Denmark has a diverse, mixed economy. It relies heavily on human resources, but not exclusively, as there are a few significant and valuable natural resources available, including mature oil and gas wells in the North Sea. Cooperatives form a large part of some sectors, be it in housing, agriculture or retail. Foundations play a large role as owners of private sector companies. Denmark's nominal GDP was estimated to be $333,238 million, the 32nd largest in the world. It has the world's lowest level of income inequality, according to the World Bank Gini (%),[8] but no legally stipulated minimum wage.[9] As of January 2015 the unemployment rate is at 6.2%, which is below the Euro Area average of 11.2%.[10] As of 28 February 2014 Denmark is among the countries with the highest credit rating.