It might not be the biggest surprise to learn that the presence of oil in a country has an effect on that country’s political character, but its rare to see the ‘resource curse’ described as clearly as in the graph below.
Source: Bennie, Lynn, Patrick Bernhagen, and Neil J. Mitchell. 2007. “The Logic of Transnational Action: the Good Corporation and the Global Compact.” Political Studies 55(4):733-753.
N.B. The political terror scale, originally developed by Freedom House, is based on data from Amnesty International and the US Department of State’s country reports. 1 stands for respect for human rights, 5 indicates widespread government killing, torture, political imprisonment and disappearances.