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 | 3,4 | -36,39 % |
| 2013 | 5,4 | 133,47 % |
| 2012 | 2,3 | -30,66 % |
| 2011 | 3,3 | -22,35 % |
| 2010 | 4,3 | 37,73 % |
| 2009 | 3,1 | 9,92 % |
| 2008 | 2,8 | 6,80 % |
| 2007 | 2,7 | -14,29 % |
| 2006 | 3,1 | 40,74 % |
| 2005 | 2,2 | 2,56 % |
| 2004 | 2,1 | -9,13 % |
| 2003 | 2,4 |