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¹ The source specifies that the International Passenger Survey (IPS) was suspended on March 16, 2020 due to the coronavirus (COVID-19) pandemic. Thus, 2020 figures are based on administrative sources and modeling, except for Q1 2020 data that is based on the IPS. Please find additional information related to the methodology. Owing to the small sample size for this year the source classed this figure as indicative and therefore not wholly comparable to other years.

² The source adds the following: "During the first half of 2021 (January to June 2021), the IPS survey was operational at UK airports only. In ordinary times surveying would also be conducted at UK tunnel terminals (Eurostar and Eurotunnel) as well as some UK sea ports (e.g. Dover), but this was not possible during this period". Dover traffic was only included from the third quarter of the year.

Figures were rounded by the source.

Figures from prior to 2019 were taken from earlier reports from the same source.

This statistic is using original data from the Office for National Statistics and includes copyright material from © Crown, licensed under the .