United Nations Environmental Program and the World Conservation Monitoring Centre, as compiled by the World Resources Institute, based on data from national authorities, national legislation and international agreements.
| Date | Value | Change, % |
|---|---|---|
| 2012 | 13.7 | 0.19% |
| 2010 | 13.7 | 15.29% |
| 2009 | 11.9 | 1.99% |
| 2008 | 11.6 | 0.63% |
| 2007 | 11.6 | 4.70% |
| 2006 | 11.0 | 1.15% |
| 2005 | 10.9 | 6.21% |
| 2004 | 10.3 | 1.25% |
| 2003 | 10.1 | 4.38% |
| 2002 | 9.7 | 17.29% |
| 2001 | 8.3 | -0.16% |
| 2000 | 8.3 |
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