These are the 15 countries that have the worst average ranking in the Eurovision Song Contest for the period of 2004-2023. Can you guess them all? The average rank is the average number of placements away from the last place in the contest; so if a country had always come last it would have an average ranking of 0 (because it's 0 places away from the last place).
For detailed information about how the calculations have been done, see this blog entry