There has been tremendous progress in the area of education: Were 1800 still 88 percent illiterate, this number 2014 has fallen to 15 percent. However, there are still countries at around the 30 percent with Nigeria, for example. The education level has risen sharply: the graph shows the respective highest school type according to absolute numbers (the wave also shows the development of the world population) including the IIASA forecast until the year 2100.