Reference 1: 2015 net income in USD PPP.
Reference 2: Switzerland, Norway, Australia, Luxembourg, South Korea, United Kingdom, Netherlands, United States, Germany, Japan, Sweden, Austria, Denmark, Iceland, Belgium, Ireland, Finland, France, New Zealand, Canada, Spain, Italy, Israel, Greece, Portugal, Slovenia, Estonia, Czech Republic, Turkey, Poland, Slovakia, Hungary, Chile and Mexico.
Source: http://en.wikipedia.org/wiki/Developed_country
Reference 2: Switzerland, Norway, Australia, Luxembourg, South Korea, United Kingdom, Netherlands, United States, Germany, Japan, Sweden, Austria, Denmark, Iceland, Belgium, Ireland, Finland, France, New Zealand, Canada, Spain, Italy, Israel, Greece, Portugal, Slovenia, Estonia, Czech Republic, Turkey, Poland, Slovakia, Hungary, Chile and Mexico.
Source: http://en.wikipedia.org/wiki/Developed_country
