http://www.euronews.com/2017/07/11/four-charts-to-better-understand-the-eu-s-population?utm_source=newsletter&utm_medium=en&utm_content=four-charts-to-better-understand-the-eu-s-population&_ope=eyJndWlkIjoiZjU3Y2JhYmUwMGUxZDFiNTUxOTU1ZDljNzExNTI1MmEifQ==
https://www.project-syndicate.org/commentary/moodys-downgrade-china-sovereign-debt-rating-by-yu-yongding-2017-06
https://www.koerber-stiftung.de/fileadmin/user_upload/koerber-stiftung/redaktion/the-berlin-pulse/pdf/2020/Koerber_TheBerlinPulse_Grafikteil_Deutsch.pdf