{"entity":{"iso2":"BG","iso3":"BGR","name":"Bulgaria","slug":"bulgaria"},"indicator":{"licence":"CC BY 4.0 (World Bank Open Data)","slug":"pisa-15-year-olds-by-mathematics-proficiency-level-percent-level-1","source":"OECD Programme for International Student Assessment (PISA)","source_url":"https://data.worldbank.org/indicator/LO.PISA.MAT.1","title":"PISA: 15-year-olds by mathematics proficiency level (%). Level 1","unit":null},"observations":[{"date":"2006-01-01","value":23.9173},{"date":"2009-01-01","value":22.6691},{"date":"2012-01-01","value":23.7714},{"date":"2015-01-01","value":21.2392},{"date":"2018-01-01","value":22.4923}],"summary":{"latest_period":"2018-01-01","latest_value":22.4923,"max":23.9173,"mean":22.8178,"min":21.2392,"of":53,"rank":15,"trend":"falling"}}