For the entries indicated as estimates, calculation as follows:
- Apapa and Tin Can - Obtained the total TEUs handled by Nigerian ports from Nigerian Ports Authority website (1,584,587 TEUs in 2012; 1,727,847 TEUs in 2013; 1,853,966 TEUs in 2014). Allocated 45% of volumes to Apapa and 35% to Tin Can based on information on page 116 of an Agence Française de Développement (AFD) report.
- Dar es salaam - Looked at the 2013 ratio of total tonnage versus total container throughput. Used this ratio to calculate the 2014 TEU based on 2014 tonnage data.