Local factors matter in achieving sustained national growth. In fact, 10% of OECD regions were responsible for 38% of OECD gross domestic product (GDP) in 2010. In Greece, the 10% of regions with the highest output contributed half or more of the national GDP. On the other hand, GDP in Denmark, Belgium, the Slovak Republic and the Netherlands was more evenly distributed among regions, with the 10% of regions with the highest output accounting for no more than 25% of total GDP. Similarly, in Colombia, the Russian Federation and Brazil, the contribution to national GDP was regionally very concentrated ().