As the largest gateway to Ireland, over 25 million passengers travelled through the airport in 2015, a 15% increase over the previous year. The main contributors to the growth in traffic in 2015 were the 23 new routes launched during the year and extra capacity on 40 existing services. Both long-haul and short-haul traffic increased by 15% in 2015. A record 8.9 million people travelled between Dublin Airport and Britain during 2015, which was a 14% increase on the previous year. Dublin Airport also welcomes more than one million passengers per annum from Northern Ireland and is a key international gateway for overseas visitors to Northern Ireland., whose largest airport is less than a quarter the size of Dublin in terms of passenger numbers.