https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf
https://leftfootforward.org/2016/04/majority-of-young-people-support-eu-membership-but-half-might-not-even-vote/
https://www.science.org/doi/10.1126/science.ade9097
https://www.europarl.europa.eu/meetdocs/2009_2014/documents/deea/dv/2203_07/2203_07en.pdf