Students take a university entrance examination at a lecture hall in the Andalusian capital of Seville, southern Spain, September 15, 2009. Students in Spain must pass the exam after completing secondary school in order to gain access to university. REUTERS/Marcelo del Pozo (SPAIN EDUCATION SOCIETY)REUTERS/Marcelo del Pozo

If we are to solve the biggest problems of our time — from climate change and food security to nuclear non-proliferation — we're going to need more scientists.

That's partly why the Organization for Economic Cooperation and Development (OECD) tracks new college degrees in 40 of the world's most advanced countries.

Now the group has released its 2015 Science, Technology and Industry Scoreboard report, which includes data up to 2012.

The ranking is based on the percentage of science, technology, engineering, or math (STEM) degrees awarded per capita so that it's a fair comparison between countries with different populations. For example, Spain ranked 11th by awarding 24% of its degrees in the natural sciences or engineering.

Here's how 10 of the smartest countries in the world stack up when it comes to science degrees:

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