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Debt in terms of economic output stood at 98.0 percent, according to Reuters calculations using gross domestic product figures from end-June 2017 to end-June 2018 according to the National Statistics Institute (INE).
That compared to a debt-to-GDP ratio of 97.9 percent in July.
Total debt in August was 1.162 trillion euros, according to the Bank of Spain.
Spain ended 2017 with a debt-to-GDP ratio of 98.3 percent and the government aims to cut debt to 97.0 percent of its GDP by the end of this year.