Globally, health expenditure as a percentage of GDP has increased in recent years, so evaluating the health care systems used in different countries is an important tool for identifying best practices and improving inefficient health care systems.
Total health expenditure is the sum of public and private health expenditures as a ratio of total population. It covers the provision of health services (preventive and curative), family planning activities, nutrition activities, and emergency aid designated for health but does not include provision of water and sanitation. Data are in international dollars converted using 2011 purchasing power parity (PPP) rates.
Data for 2016 is used as it is the year with up-to-date data for nearly all countries.
This isn't accurate at all but, out of interest, I'm dividing life expectancy by healthcare expenditure as a proxy for healthcare efficiency.