Based on a comparison of 95 countries in 2014, South Korea ranked the highest in R&D expenditures as a percentage of GDP with 4.29% followed by Israel and Japan. On the other end of the scale was Madagascar with 0.016%, Iraq with 0.039% and Guatemala with 0.045%.
Data for more countries are available at R&D Expenditures (As % of GDP) indicator page.
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