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 | 25,8 | 4,18 % |
| 2013 | 24,8 | 1,05 % |
| 2012 | 24,5 | 4,24 % |
| 2011 | 23,5 | -3,16 % |
| 2010 | 24,3 | 0,34 % |
| 2009 | 24,2 | 11,04 % |
| 2008 | 21,8 | 8,92 % |
| 2007 | 20,0 | -23,33 % |
| 2006 | 26,1 | 1,37 % |
| 2005 | 25,8 | 6,42 % |
| 2004 | 24,2 | 0,30 % |
| 2003 | 24,1 |