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 | 31.7 | 0.00% |
| 2010 | 31.7 | 17.79% |
| 2009 | 26.9 | 0.00% |
| 2008 | 26.9 | 0.00% |
| 2007 | 26.9 | 1.32% |
| 2006 | 26.5 | 0.00% |
| 2005 | 26.5 | 0.08% |
| 2004 | 26.5 | 0.03% |
| 2003 | 26.5 | 0.00% |
| 2002 | 26.5 | 0.52% |
| 2001 | 26.4 | -5.14% |
| 2000 | 27.8 |
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