Clean energy is noncarbohydrate energy that does not produce carbon dioxide when generated. It includes hydropower and nuclear, geothermal, and solar power, among others.
| Date | Valeur | Modifier , % |
|---|---|---|
| 2014 | 24,5 | -5,83 % |
| 2013 | 26,1 | 2,56 % |
| 2012 | 25,4 | 14,97 % |
| 2011 | 22,1 | -5,04 % |
| 2010 | 23,3 | 6,43 % |
| 2009 | 21,9 | 13,53 % |
| 2008 | 19,3 | 23,92 % |
| 2007 | 15,5 | 11,02 % |
| 2006 | 14,0 | -31,11 % |
| 2005 | 20,3 | -1,69 % |
| 2004 | 20,7 | 10,12 % |
| 2003 | 18,8 |