International guidelines on standards are available through the recently established ISO 50001 Energy Management Systems and are also available through ISO 14 000 Environmental Management Systems, which includes suggestions for continuous improvement in energy efficiency. Developed countries with energy management system standards include Australia, Canada, Denmark, Germany, Ireland, Republic of Korea, the Netherlands, Sweden, the United Kingdom and the United States. Regional standards have also been established, such as the European Energy Management Standard (EN 16001), introduced in 2009.