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 | 5,2 | -0,24 % |
| 2013 | 5,3 | 21,96 % |
| 2012 | 4,3 | 23,79 % |
| 2011 | 3,5 | 15,93 % |
| 2010 | 3,0 | 5,45 % |
| 2009 | 2,8 | 9,73 % |
| 2008 | 2,6 | -4,36 % |
| 2007 | 2,7 | 4,46 % |
| 2006 | 2,6 | 9,46 % |
| 2005 | 2,4 | 2,12 % |
| 2004 | 2,3 | 8,36 % |
| 2003 | 2,1 |