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 , % |
|---|---|---|
| 2015 | 3,7 | 48,58 % |
| 2014 | 2,5 | -0,33 % |
| 2013 | 2,5 | 61,19 % |
| 2012 | 1,6 | 16,57 % |
| 2011 | 1,3 | 8,67 % |
| 2010 | 1,2 | -2,87 % |
| 2009 | 1,3 | -14,56 % |
| 2008 | 1,5 | 23,34 % |
| 2007 | 1,2 | 22,99 % |
| 2006 | 1,0 | 20,34 % |
| 2005 | 0,8 | 3,69 % |
| 2004 | 0,8 |