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Eurovision Song Contest Coefficient
The Eurovision Song Contest Coefficient, or ESC Coefficient for short, is a ranking system for countries competing in the Eurovision Song Contest. It is based on a modified version of the UEFA coefficient which is used for European football.

Introduced in 2019, the system uses the average points from a country's Eurovision entries of the previous 5 years. Each coefficient divides each of the average points total, with the most recent year having the most effect whilst the earliest year has the least. The calculation is then multiplied by 10 to give the coefficient. Using the current voting system, countries can be tracked back to 1975 due to the implementation of the voting system that year. The first eligible coefficient was created for the Eurovision Song Contest 1979.

Current ranking
This is the current ranking following the Eurovision Song Contest 2018.

List of number-one countries
The following is a list of the number-one countries since the first coefficient in 1979.

Largest gains
The following list contains the songs that had the most positive effect on their country's coefficient: