Statistics: What is the cost of mailing a letter in Europe?

A very interesting survey by the Deutsche Post on the current prices of mail in Europe was presented yesterday on the pages of the Spanish Federation (FESOFI).

The Deutsche Post has compared letter mail prices in the 27 member states of the European Union, the United Kingdom, Iceland, Norway and Switzerland. Basic results show that:

(a) domestic letter rates range from €0.30 to €3.90 (view chart here).
(b) international rates for letters sent within Europe range from €0.59 to €4.84 (view chart here).
(c) inflation adjusted rates between 2012-21 range from 5.0-281.5% (view chart here).

These and more interesting results are reported on the Deutsche Post webpage here: https://www.dpdhl.com/en/media-relations/press-releases/2022/letter-prices-in-germany-among-the-lowest-in-europe.html