Below Afghanistan in the ranking are, in order, the Democratic Republic of Congo, Yemen, Chad, the Central African Republic, South Sudan and Somalia.
Denmark tops the index with a score of 1.213, followed by Finland at 1.245 and Sweden at 1.280.
According to the report, Afghanistan was the only South Asian country to deteriorate on the Positive Peace Index between 2015 and 2024.
Afghanistan’s score stood at 4.055 in 2015 and rose to 4.19 by 2024, representing a 3.3% deterioration in its performance on the index.
The decline was mainly attributed to sharp deterioration in indicators related to political freedom and the free flow of information.
According to the report, press freedom in Afghanistan declined by 78.8%, the largest deterioration in any individual indicator among countries in the region.
Information quality also declined by 23.4%, while laws supporting equality among different population groups deteriorated by 25%.
Exclusion based on socio-economic groups worsened by 20.4%, while government effectiveness declined by 13.2%.
The report says press freedom also deteriorated in most other South Asian countries, including by 60% in Bhutan and 45.4% in India.
However, Afghanistan was the only country in the region whose overall Positive Peace score deteriorated between 2015 and 2024.
By contrast, South Asia improved by an average of 2.9% over the period.
Sri Lanka recorded the largest improvement at 6.3%, followed by India at 6%.
Nepal improved by 4.7%, Bhutan by 4.1%, Bangladesh by 3.5% and Pakistan by 0.9%.
The Institute for Economics and Peace says Positive Peace is not limited to the absence of war and conflict but examines the conditions and structures that enable peaceful societies to be created and sustained.
The index considers factors including effective government, the free flow of information, human capital, good relations with neighbouring countries, acceptance of the rights of others and low levels of corruption.
The report is based on an analysis of more than 20,000 datasets and indicators across 163 countries, with the ranking drawing on data up to 2024.
The Institute for Economics and Peace, an independent non-profit organisation, also publishes the Global Peace Index.
However, the Positive Peace Index differs from the Global Peace Index. Positive Peace focuses on the factors and structures that help create and sustain peace, while the Global Peace Index measures how peaceful countries are based on levels of violence, conflict and insecurity.