Water productivity is calculated as GDP in constant prices of 2010 divided by annual total water withdrawal.
| 1970 | 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Benin | 29.5 | 46.6 | 57.9 | 70.0 | 72.0 | 75.5 | 80.9 | 86.1 | 87.6 | 90.5 | 95.7 | 102.1 | 109.1 | 113.3 | 121.4 | |
| Burkina Faso | 8.7 | 7.9 | 8.5 | 11.1 | 11.8 | 12.6 | 13.3 | 13.9 | 14.5 | 15.3 | 16.3 | 17.4 | 18.4 | 18.7 | 20.0 | |
| केप वर्दे | 29.9 | 21.3 | 20.3 | 18.9 | 17.6 | 16.6 | 15.6 | 15.3 | 15.1 | 14.9 | 14.4 | 8.1 | 10.5 | |||
| Côte d'Ivoire | 20.7 | 21.6 | 18.5 | 26.0 | 25.4 | 28.3 | 32.4 | 36.8 | 39.4 | 42.3 | 45.4 | 47.6 | 50.8 | 51.1 | 54.8 | |
| Ghana | 34.3 | 17.5 | 20.4 | 23.0 | 28.1 | 31.3 | 33.3 | 35.2 | 35.6 | 34.4 | 35.3 | 38.1 | 40.5 | 43.1 | 43.4 | 45.6 |
| Guinea Bissau | 4.0 | 4.7 | 5.6 | 6.1 | 6.0 | 6.1 | 6.2 | 6.6 | 6.9 | 7.3 | 7.5 | 8.0 | 8.1 | 8.6 | ||
| Liberia | 12.9 | 16.9 | 12.2 | 17.3 | 18.7 | 20.2 | 22.0 | 22.1 | 22.1 | 21.8 | 22.3 | 22.6 | 22.0 | 21.4 | 22.4 | |
| Mali | 2.1 | 1.4 | 1.9 | 2.5 | 2.6 | 2.6 | 2.6 | 2.8 | 3.0 | 3.2 | 3.4 | 3.5 | 3.7 | 3.7 | 3.8 | |
| Niger | 6.9 | 5.4 | 5.7 | 5.7 | 5.6 | 5.9 | 6.0 | 6.1 | 5.6 | 5.9 | 6.8 | 4.7 | 4.7 | 4.9 | 5.0 | |
| Nigeria | 22.9 | 17.4 | 23.7 | 30.9 | 32.6 | 34.0 | 36.2 | 38.5 | 39.5 | 38.9 | 39.2 | 40.0 | 40.8 | 40.1 | 41.6 | |
| Senegal | 5.4 | 6.6 | 5.5 | 6.2 | 6.2 | 6.4 | 6.5 | 6.9 | 7.3 | 7.7 | 8.2 | 7.1 | 7.4 | 7.5 | 8.0 | |
| Sierra Leone | 18.6 | 17.0 | 21.9 | 26.5 | 28.6 | 31.6 | 36.3 | 33.4 | 32.0 | 34.0 | 35.1 | 36.2 | 38.1 | 37.7 | 39.9 | |
| Gambia | 13.4 | 10.6 | 10.8 | 13.3 | 12.2 | 12.9 | 13.2 | 13.0 | 13.6 | 13.8 | 14.5 | 15.5 | 16.5 | 16.6 | 17.5 | |
| Togo | 25.8 | 20.6 | 16.5 | 19.5 | 20.6 | 21.9 | 23.2 | 24.5 | 25.8 | 26.9 | 28.0 | 29.3 | 30.8 | 31.4 | 33.3 |