| Sigma-convergence | 2001 | 2006 | 2008 | 2011 | 2016 | 2018 |
| GDP/capita | 25 | 4.93 | 7.17 | 1.55 | 6.15 | 5.78 |
| GNI/capita | 5.06 | 13.52 | 5.78 | 2.29 | 5.65 | 7.43 |