"Figure 8: There was on average of 93 cargo and tanker ship visits in the week ending 14 March 2021, a 14% decrease from the previous week and 23% lower than the same period a year ago","" "Daily movements in shipping visits, UK, seasonally adjusted, 1 December 2019 to 14 March 2021","" "","" "Notes","1. The vertical lines indicate key events. In order, the events are: Storm Ciara; FCO advises against all non-essential international travel; Lockdown begins; UK international travel quarantine begins; travel corridors to 59 countries come into force; Storm Ellen; Storm Francis; Storm Alex; Storm Aiden; Storm Darcy. 2. The number of visits for Hull are included in these data from 1 June 2020 onwards. 3. The seasonally adjusted estimates are produced using a modified version of the seasonal adjustment method TRAMO-SEATS. More information is available in the [Coronavirus and the latest indicators for the UK economy and society methodology](https://www.ons.gov.uk/economy/economicoutputandproductivity/output/methodologies/coronavirusandthelatestindicatorsfortheukeconomyandsocietymethodology). 4. The seasonal adjustment method may be limited as this is a short time series. 5. Daily and weekly shipping visits and unique visits are available by port in the [dataset](https://www.ons.gov.uk/economy/economicoutputandproductivity/output/datasets/weeklyshippingindicators), along with non-seasonally adjusted aggregate series. 6. The trend is now calculated as a rolling seven-day average of the number of daily ship and cargo and tanker ship visits. The presentation of the series has been shifted three days forward, this does not affect the calculation of the average. 7. Users should note that a reduction in shipping activity has been observed over the Christmas periods in 2019 and 2020." 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