The Institute for Economics and Peace annually publishes the Global Peace Index, which ranks 158 countries based on their levels of peacefulness as measured by 23 qualitative and quantitative indicators. The 2012 report found slight improvements in peace levels globally, with declines largely limited to countries affected by Arab Spring uprisings such as Syria, Egypt and Tunisia. Iceland remained the most peaceful country, while Somalia was again the least peaceful due to ongoing conflict. The report also introduced a new Positive Peace Index measuring factors that sustain peaceful societies.