The port had the third-largest volume of freight traffic, in Wales, in 2018 (5.2 million tonnes), after Milford Haven and Port Talbot, and it is the main port for freight and sea passenger transport with the Republic of Ireland, handling more than 2 million passengers each year. 81% of freight traffic going through Welsh ports to the Republic of Ireland, and 75.5% of sea passenger traffic between Wales and the Republic of Ireland went through Holyhead in 2018. Historically, there were two routes between Holyhead and the Irish ports of Dublin and Dun Laoghaire. The route to Dun Laoghaire was the most popular in 1998 with over 1.7 million passengers ferried, however following a consistent decline in passenger traffic, it was removed in 2015. The other route to Dublin saw an overall increase in passenger numbers from just over 1 million in 1998 to just over 1.9 million in 2018, an increase of 82%.