twice a year, and receive media coverage. Based upon the findings, the federal government establishes targets for improvement of primary and secondary education across schools. In the initial years of IDEB's implementation, 2007–2009, it was found that over 70% of municipalities either reached or exceeded targets set by the Ministry of Education and INEP for early primary education. Educational performance and outcomes According to data from the SAEB/Proval Brasil from 1999 to 2007, there is evidence that educational performance is improving in all regions of Brazil. Performance for the lowest income students has also improved. According to the World Bank, Brazil increased PISA scores more for the lowest income groups than the highest income groups. However, gaps in school attendance and learning levels still remain between different income groups. PISA learning outcomes The Program for International Student Assessment (PISA) test is designed to measure trends in countries' average student scores over time, relative to a mean score of 500 achieved by the OECD countries as a group in the year 2000. Brazil has participated in PISA since 2000. Brazil had the strongest improvement in math and 3rd largest improvement overall (after Luxembourg and Chile) between 2000 and 2009 on PISA, but its absolute scores are still low compared to other participants. For example, 60% of students still scored below 400-showing that they lacked basic numeracy skills—compared with 14% across the OECD and 3-5% in top performing countries Shanghai and Korea. Additionally, Brazil falls behind others in the LAC (Latin American and Caribbean) region, including Chile, Uruguay and Mexico; and LAC countries as a whole trail the OECD average performance. According to the World Bank, "The gap in math skills between the average student in Shanghai and the average Brazilian student is approximately 5 school years." Student attendance After the expansion in education policies, enrollment rates in primary and lower-secondary education have increased. The percentage of children who finish primary education has increased from 42% to 71%, and the percentage of children who complete secondary school has increased from 28% to 55%. Additionally, in 1993 secondary education was often attained only when students came from parents who had attained secondary education. As of 2009, students complete between 9 and 11 years of schooling regardless of the schooling level of their parents, which ranges from 0–10 years. According to the 2007 National Household Sample Survey carried out by the Brazilian Institute for