{"entity":{"iso2":"TO","iso3":"TON","name":"Tonga","slug":"tonga"},"indicator":{"licence":"CC BY 4.0 (Our World in Data)","slug":"years-of-schooling","source":"UNDP, Human Development Report (2025) \u2013 with minor processing by Our World in Data","source_url":"https://ourworldindata.org/grapher/years-of-schooling","title":"Average years of schooling among adults","unit":"years"},"observations":[{"date":"1990-01-01","value":9.12018},{"date":"1991-01-01","value":9.30478},{"date":"1992-01-01","value":9.48938},{"date":"1993-01-01","value":9.67398},{"date":"1994-01-01","value":9.85858},{"date":"1995-01-01","value":10.0432},{"date":"1996-01-01","value":10.03},{"date":"1997-01-01","value":10.034},{"date":"1998-01-01","value":10.038},{"date":"1999-01-01","value":10.042},{"date":"2000-01-01","value":10.046},{"date":"2001-01-01","value":10.05},{"date":"2002-01-01","value":10.054},{"date":"2003-01-01","value":10.058},{"date":"2004-01-01","value":10.062},{"date":"2005-01-01","value":10.066},{"date":"2006-01-01","value":10.07},{"date":"2007-01-01","value":10.24},{"date":"2008-01-01","value":10.41},{"date":"2009-01-01","value":10.58},{"date":"2010-01-01","value":10.75},{"date":"2011-01-01","value":10.92},{"date":"2012-01-01","value":10.9114},{"date":"2013-01-01","value":10.9029},{"date":"2014-01-01","value":10.8943},{"date":"2015-01-01","value":10.8857},{"date":"2016-01-01","value":10.8771},{"date":"2017-01-01","value":10.8686},{"date":"2018-01-01","value":10.86},{"date":"2019-01-01","value":10.8514},{"date":"2020-01-01","value":10.8803},{"date":"2021-01-01","value":10.9149},{"date":"2022-01-01","value":10.9149},{"date":"2023-01-01","value":10.9149}],"summary":{"latest_period":"2023-01-01","latest_value":10.9149,"max":10.92,"mean":10.3417,"min":9.12018,"of":192,"rank":71,"trend":"rising"}}