(LONDON) — Modern slavery is most prevalent in North Korea and other repressive regimes, but developed nations also bear responsibility for it because they import $350 billion worth of goods that are produced under suspicious circumstances, according to research released Thursday. The Global Slavery Index estimates 40.3 million people worldwide were subjected to modern slavery in 2016, with the highest concentration in North Korea, where one in 10 people lived under such conditions. “This index makes us visible,” North Korean defector Yeon-mi Park, who escaped to China where she was trafficked and forced into marriage, said at a news conference at U.N.