Weekly Vessels calls in World Ports, 2020 vs 2019 Vessel Calls In World Ports 2020 vs 2019 per week Source: UNCTAD Project (2021; in progress) “Assessing the impact of COVID-19 on the maritime transport systems”. Geneva: UNCTAD. Share this:Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)