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 | 37.0 | 0.01% |
| 2010 | 37.0 | -2.50% |
| 2009 | 38.0 | 0.00% |
| 2008 | 38.0 | 0.36% |
| 2007 | 37.8 | 0.00% |
| 2006 | 37.8 | 0.00% |
| 2005 | 37.8 | 0.00% |
| 2004 | 37.8 | 0.00% |
| 2003 | 37.8 | 0.00% |
| 2002 | 37.8 | 0.00% |
| 2001 | 37.8 | 2.00% |
| 2000 | 37.1 |
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