GDP
Gross Domestic Product: The total value of all goods and services produced domestically by a nation during a year. It is equivalent to gross national product minus net investment incomes from foreign nations.
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The UK is increasing gradually every year, but it then drops gradually during the years 2007-2009 and then it starts increasing again. The graph shows Mongolia at a constant 0 because Mongolia's GDP is in the 1-10 billions range and the UK is in the billions and trillions range.