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 | Value | Change, % |
|---|---|---|
| 2012 | 3.32 | 3.71% |
| 2011 | 3.20 | -5.90% |
| 2010 | 3.40 | -2.90% |
| 2009 | 3.50 | 1.21% |
| 2008 | 3.46 | -7.76% |
| 2007 | 3.75 | 0.37% |
| 2006 | 3.74 | -1.89% |
| 2005 | 3.81 | 0.56% |
| 2004 | 3.79 | 10.50% |
| 2003 | 3.43 | -2.80% |
| 2002 | 3.53 | -1.15% |
| 2001 | 3.57 |
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