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 | 22.2 | 0.00% |
| 2010 | 22.2 | 1.63% |
| 2009 | 21.8 | 0.00% |
| 2008 | 21.8 | 0.00% |
| 2007 | 21.8 | 0.00% |
| 2006 | 21.8 | 0.00% |
| 2005 | 21.8 | 0.00% |
| 2004 | 21.8 | 0.00% |
| 2003 | 21.8 | 0.00% |
| 2002 | 21.8 | 0.00% |
| 2001 | 21.8 | -0.39% |
| 2000 | 21.9 |
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