https://www.esri.ie/system/files/publications/SUSTAT117.pdf
http://europa.eu/rapid/press-release_IP-18-463_en.htm
https://www.mckinsey.com/mgi/our-research/global-trade-explorer?sector=0ag
https://blogs.lse.ac.uk/brexit/2019/12/03/a-missed-opportunity-revisiting-the-euro-referendum-that-never-was-from-a-historical-perspective/