lower class was made of those who worked the land. After the Mexican Revolution, the government ceded an estimated 50 percent of the land to the general population, covering a small portion of the gap between the wealthy and the poor. Land ownership continued to be the main source of wealth for Mexicans and has dictated the hierarchy of wealth distribution amongst the population. After the country entered its economic industrial transformation, industrialists, businessmen, and politicians have controlled the direction of wealth in Mexico and have remained among the wealthy. The average individual gross annual income in Mexico in 2002 was US$6,879.37 (2010 dollars). 12.3 percent of the Mexican labor force earns the daily minimum wage or MX$1,343.28 per month (approx. US$111.94 November 2010 exchange rates). 20.5 of the labor force earns twice the minimum wage and 21.4 percent earns up to three times the daily minimum wage while 18.6 earn no more than five daily minimum wages. Only 11.8 percent of the working population earn wages equal or above MX$6,716.40 (US$559.70) per month. According to Jaime Saavedra, World Bank Poverty Manager for Latin America, Mexico has made considerable strides in poverty reduction since the late 1990s, with performance above the Latin American average. Saavedra explained that: "Between 2000 and 2004, extreme poverty fell almost seven percentage points, which can be explained by development in rural areas, where extreme poverty fell from 42.4 per cent to 27.9 per cent. The urban poverty rate, however, got stuck at 11.3 per cent." Government involvements Social development began to take place in the form of written policy in the early 1900s. The Mexican Constitution, approved in 1917, outlined the basic social protections citizens are entitled to, including the right to property, education, health care, and employment; and it establishes the federal government responsible for the execution and enforcement of these protections. The global economic crisis of the late 1920s and forward slowed down any possibility of social development in the country. Between the 1920s and the 1940s the illiteracy levels range between 61.5 and 58 percent, due this the government focused on establishing social protection institutions. By the late 1950s, 59 percent of the population knew how to read and write. In the 2000s only 9.5 percent of the population older than 15 years was illiterated. By the 1960s, individual involvement of some states to increase social development, along with the country's economic