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 | 2,2 | 12,98 % |
| 2013 | 2,0 | -3,30 % |
| 2012 | 2,0 | 15,80 % |
| 2011 | 1,8 | -1,53 % |
| 2010 | 1,8 | 32,47 % |
| 2009 | 1,4 | -16,83 % |
| 2008 | 1,6 | -13,09 % |
| 2007 | 1,9 | 4,60 % |
| 2006 | 1,8 | 3,20 % |
| 2005 | 1,7 | -3,75 % |
| 2004 | 1,8 | -9,19 % |
| 2003 | 2,0 |