| Country or Area | Year | Value | |
|---|
| Afghanistan | 2022 | 2 |
| Afghanistan | 2020 | 3.5 |
| Afghanistan | 2019 | 3.5 |
| Afghanistan | 2018 | 3.5 |
| Afghanistan | 2017 | 3.5 |
| Afghanistan | 2016 | 3.5 |
| Afghanistan | 2015 | 3.5 |
| Afghanistan | 2014 | 3.5 |
| Afghanistan | 2013 | 3.5 |
| Afghanistan | 2012 | 3.5 |
| Afghanistan | 2011 | 3.5 |
| Afghanistan | 2010 | 3.5 |
| Afghanistan | 2009 | 3.5 |
| Afghanistan | 2008 | 3 |
| Afghanistan | 2007 | 3 |
| Afghanistan | 2006 | 3 |
| Africa Eastern and Southern | 2022 | 2.6842105263157894 |
| Africa Eastern and Southern | 2021 | 2.736842105263158 |
| Africa Eastern and Southern | 2020 | 2.763157894736842 |
| Africa Eastern and Southern | 2019 | 2.8157894736842106 |
| Africa Eastern and Southern | 2018 | 2.9444444444444446 |
| Africa Eastern and Southern | 2017 | 2.9473684210526314 |
| Africa Eastern and Southern | 2016 | 3.0555555555555554 |
| Africa Eastern and Southern | 2015 | 3.0555555555555554 |
| Africa Eastern and Southern | 2014 | 3.0833333333333335 |
| Africa Eastern and Southern | 2013 | 2.8947368421052633 |
| Africa Eastern and Southern | 2012 | 2.9210526315789473 |
| Africa Eastern and Southern | 2011 | 3 |
| Africa Eastern and Southern | 2010 | 3 |
| Africa Eastern and Southern | 2009 | 3.0277777777777777 |
| Africa Eastern and Southern | 2008 | 3 |
| Africa Eastern and Southern | 2007 | 3.0555555555555554 |
| Africa Eastern and Southern | 2006 | 3.0277777777777777 |
| Africa Eastern and Southern | 2005 | 3.0277777777777777 |
| Africa Western and Central | 2022 | 3.2 |
| Africa Western and Central | 2021 | 3.2 |
| Africa Western and Central | 2020 | 3.2 |
| Africa Western and Central | 2019 | 3.2 |
| Africa Western and Central | 2018 | 3.1 |
| Africa Western and Central | 2017 | 3.1 |
| Africa Western and Central | 2016 | 3.1 |
| Africa Western and Central | 2015 | 3.1 |
| Africa Western and Central | 2014 | 3.1 |
| Africa Western and Central | 2013 | 3.125 |
| Africa Western and Central | 2012 | 3.15 |
| Africa Western and Central | 2011 | 3.175 |
| Africa Western and Central | 2010 | 3.15 |
| Africa Western and Central | 2009 | 3.05 |
| Africa Western and Central | 2008 | 3 |
| Africa Western and Central | 2007 | 3.026315789473684 |
