| Reference Area | Time Period | Unit of measurement | Nature | Value |
|---|
| World | 2014 | Percent | Not Available | 1.3 |
| World | 2010 | Percent | Not Available | 2.8 |
| World | 2005 | Percent | Not Available | 2.3 |
| World | 2000 | Percent | Not Available | 3.0 |
| Caucasus and Central Asia | 2014 | Percent | Not Available | 4.1 |
| Caucasus and Central Asia | 2010 | Percent | Not Available | 5.5 |
| Caucasus and Central Asia | 2005 | Percent | Not Available | 10.4 |
| Caucasus and Central Asia | 2000 | Percent | Not Available | 7.0 |
| Developed regions | 2014 | Percent | Not Available | 1.4 |
| Developed regions | 2010 | Percent | Not Available | 2.3 |
| Developed regions | 2005 | Percent | Not Available | 2.2 |
| Developed regions | 2000 | Percent | Not Available | 3.5 |
| Developing regions | 2014 | Percent | Not Available | 3.1 |
| Developing regions | 2010 | Percent | Not Available | 6.2 |
| Developing regions | 2005 | Percent | Not Available | 5.2 |
| Developing regions | 2000 | Percent | Not Available | 4.2 |
| Eastern Asia | 2014 | Percent | Not Available | 5.6 |
| Eastern Asia | 2010 | Percent | Not Available | 9.1 |
| Eastern Asia | 2005 | Percent | Not Available | 8.0 |
| Eastern Asia | 2000 | Percent | Not Available | 7.6 |
| Landlocked developing countries | 2014 | Percent | Not Available | 3.1 |
| Landlocked developing countries | 2010 | Percent | Not Available | 4.9 |
| Landlocked developing countries | 2005 | Percent | Not Available | 6.0 |
| Landlocked developing countries | 2000 | Percent | Not Available | 1.6 |
| Latin America and the Caribbean | 2014 | Percent | Not Available | 0.2 |
| Latin America and the Caribbean | 2010 | Percent | Not Available | 4.4 |
| Latin America and the Caribbean | 2005 | Percent | Not Available | 3.0 |
| Latin America and the Caribbean | 2000 | Percent | Not Available | 2.8 |
| Least developed countries | 2014 | Percent | Not Available | 3.1 |
| Least developed countries | 2010 | Percent | Not Available | 3.4 |
| Least developed countries | 2005 | Percent | Not Available | 5.5 |
| Least developed countries | 2000 | Percent | Not Available | 1.7 |
| Northern Africa | 2014 | Percent | Not Available | -0.7 |
| Northern Africa | 2010 | Percent | Not Available | 2.4 |
| Northern Africa | 2005 | Percent | Not Available | 3.8 |
| Northern Africa | 2000 | Percent | Not Available | 2.1 |
| Oceania | 2014 | Percent | Not Available | 1.7 |
| Oceania | 2010 | Percent | Not Available | 2.0 |
| Oceania | 2005 | Percent | Not Available | 0.7 |
| Oceania | 2000 | Percent | Not Available | -0.9 |
| Small island developing States | 2014 | Percent | Not Available | 1.5 |
| Small island developing States | 2010 | Percent | Not Available | 5.5 |
| Small island developing States | 2005 | Percent | Not Available | 3.6 |
| Small island developing States | 2000 | Percent | Not Available | 4.0 |
| South-eastern Asia | 2014 | Percent | Not Available | 3.1 |
| South-eastern Asia | 2010 | Percent | Not Available | 6.8 |
| South-eastern Asia | 2005 | Percent | Not Available | 4.4 |
| South-eastern Asia | 2000 | Percent | Not Available | 4.5 |
| Southern Asia | 2014 | Percent | Not Available | 5.2 |
| Southern Asia | 2010 | Percent | Not Available | 7.1 |
