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 | 21.5 | 0.00% |
| 2010 | 21.5 | 116.99% |
| 2009 | 9.9 | 3.20% |
| 2008 | 9.6 | 9.53% |
| 2007 | 8.8 | 4.43% |
| 2006 | 8.4 | 3.26% |
| 2005 | 8.1 | 11.57% |
| 2004 | 7.3 | 11.01% |
| 2003 | 6.6 | 5.21% |
| 2002 | 6.2 | 3.02% |
| 2001 | 6.1 | -57.17% |
| 2000 | 14.1 |
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