According to the Peterson Institute for International Economics and other proponents of demographic structural approach (cliodynamics), the basic problem Egypt has an unemployment rate driven by a demographic youth bulge: with the number of new people entering the job force at about 4% a year, unemployment in Egypt is almost 10 times as high for college graduates as it is for people who have gone through elementary school, particularly educated urban youth, who comprised most of the people that were seen out in the streets during the Egyptian Revolution of 2011. An estimated 75% of Egyptians are under the age of 25 with just 3% over the age of 65, making it one of the most youthful populations in the world.[3][4]