OECD (2013), "Table B2.4 - Expenditure on educational institutions, by service category, as a percentage of GDP (2010): Expenditure on instruction, R&D and ancillary services in educational institutions and private expenditure on educational goods purchased outside educational institutions", in Education at a Glance 2013: OECD Indicators, OECD Publishing, Paris, https://doi.org/10.1787/eag-2013-table91-en.