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 | 18.4 | 0.00% |
| 2010 | 18.4 | 0.06% |
| 2009 | 18.4 | 0.00% |
| 2008 | 18.4 | 0.00% |
| 2007 | 18.4 | 2.42% |
| 2006 | 18.0 | 1.43% |
| 2005 | 17.7 | 0.00% |
| 2004 | 17.7 | 0.00% |
| 2003 | 17.7 | 0.00% |
| 2002 | 17.7 | 0.00% |
| 2001 | 17.7 | -0.07% |
| 2000 | 17.7 |
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