https://www.ccomptes.fr/system/files/2019-04/20190418-refere-2018-4023-plan-relance-autoroutier.pdf
https://data.oecd.org/natincome/net-lending-borrowing-by-sector.htm
http://www.europarl.europa.eu/ftu/pdf/en/FTU_5.9.1.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/966868/BUDGET_2021_-_web.pdf