What percentage of the world's population lives in developing countries?

According to the Human Development Index, a development scale of 0-1, there are 35 countries and territories/dependencies with a development level of 0.9 or above, meaning "highly developed". The total population (as of 7/1/2008) of the countries in that category is 978,186,023 or 14.6% of world population (6,706,992,932). This means that 85.4% (5,727,771,964) of the world's population lives in developing countries.