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developed country average income
average income in developing countries
developed country per capita income
average income of a country
average annual income by country
income level by country
countries by average income
per capita income of developing countries
annual income by country
country by median income
income data by country
developed country average income, average income in developing countries, developed country per capita income, average income of a country, average annual income by country, income level by country, countries by average income, per capita income of developing countries, annual income by country, country by median income, income data by country
