The information is in the original papers. If they wanted to give relevant information, they’d have to give twenty to forty numbers: one for each country, upper and lower bar, for previous generation and the current one, in currency (and the Euro has been introduced in several countries) for and likely offer inflation-corrected, purchase-power index, etc.
The Economist has a strict rule about offering as simple infographics as possible and this has generally served them well.
