Reading and science scores are also significantly above OECD average and have increased since PISA results in both 2000 and 2003. The impact of socio-economic status on mathematics scores has decreased compared to 2000, but is still slightly above the OECD average (Figure 1). Germany is one of only three OECD countries where both mathematics scores and equity indicators have improved since 2003. An above-average proportion of 25-64 year-olds completed vocational upper secondary or post-secondary non-tertiary level education (55.8% compared to the OECD average of 33.5%). Germany was an above-average performer in all areas examined in PISA 2012, including problem solving, and the share of low achievers in mathematics has decreased significantly (from 21.6% in 2003 to 17.7% in 2012, below the OECD average of 23%) (Figure 3).