Years | Benin | Senegal | Niger |
| Burkina-Faso | Togo | Average/year |
2003 | 0.9140 | 0.895 |
| 0.671 | 0.767 | 1 | 0.849 |
2004 | 0.907 | 0.845 |
| 0.569 | 0.638 | 0.993 | 0.790 |
2005 | 0.922 | 0.851 |
| 0.665 | 0.825 | 0.993 | 0.851 |
2006 | 0.922 | 0.839 |
| 0.759 | 0.727 | 1 | 0.849 |
2007 | 0.974 | 0.857 |
| 0.624 | 0.713 | 1 | 0.834 |
2008 | 0.919 | 0.872 |
| 1 | 0.813 | 0.962 | 0.913 |
2009 | 0.936 | 0.869 |
| 0.650 | 0.711 | 1 | 0.833 |
2010 | 0.932 | 0.884 |
| 0.869 | 0.750 | 1 | 0.887 |
2011 | 0.935 | 0.903 |
| 0.672 | 0.821 | 0.998 | 0.866 |
2012 | 0.950 | 0.923 |
| 1 | 0.813 | 1 | 0.937 |
2013 | 1 | 0.923 |
| 0.730 | 0.795 | 0.989 | 0.887 |
2014 | 1 | 0.958 |
| 0.808 | 0.788 | 1 | 0.911 |
2015 | 0.988 | 0.954 |
| 0.698 | 0.788 | 1 | 0.886 |
2016 | 0.988 | 0.972 |
| 0.732 | 0.828 | 1 | 0.904 |
2017 | 1 | 1 |
| 0.726 | 0.845 | 1 | 0.914 |
Average | 0.952 | 0.903 | 0.745 | 0.775 | 0.995 | 0.874 | |
Average inefficiency | 0.048 | 0.097 | 0.255 | 0.225 | 0.005 | 0.126 |