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 | 5,7 | 38,72 % |
| 2013 | 4,1 | -2,22 % |
| 2012 | 4,2 | 21,58 % |
| 2011 | 3,4 | -29,44 % |
| 2010 | 4,9 | 13,45 % |
| 2009 | 4,3 | 17,21 % |
| 2008 | 3,7 | -3,38 % |
| 2007 | 3,8 | -4,95 % |
| 2006 | 4,0 | -12,16 % |
| 2005 | 4,5 | 13,43 % |
| 2004 | 4,0 | -1,13 % |
| 2003 | 4,0 |