“According to Brittany Ferries, Brexit had a significant influence on the figures.” https://trans.info/en/ireland-freight-routes-331477
“Freight being shipped between Hull and Rotterdam is taking twice as long to clear both ports as it did before…
“Port chief says there has been a ‘reset’ in trade between Ireland, Britain and EU.” https://www.irishtimes.com/business/brexit-ends-landbridge-route-as-dublin-port-records-sharp-fall-in-lorry-freight-1.4781620