{"chart":{"slug":"clinical-trials-started-per-year","title":"How many clinical trials start each year?","takeaway":"About 31,100 clinical trials registered on ClinicalTrials.gov started in 2025, up from about 11,900 in 2008 and 1,900 in 2000, the registry's first year. Early years count fewer trials because registering wasn't required until medical journals asked for it in 2005 and a U.S. law did in 2007; late registrations still add a few to recent years. ClinicalTrials.gov lists trials from around the world, not only the U.S.","topic":"Clinical trials","chart_type":"line","ranking":false,"x_label":"Year the trial started","y_label":"Clinical trials started","unit":null,"points_count":26,"source":{"name":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2","url":"https://clinicaltrials.gov/data-api/api"},"license":{"name":"Public domain (U.S. government work); source National Library of Medicine","url":"https://www.nlm.nih.gov/web_policies.html#copyright"},"data_as_of":"2026-11-03","updated_at":"2026-11-03T17:21:11.739Z","url":"https://chart.ly/charts/clinical-trials-started-per-year","api_url":"https://chart.ly/api/v1/charts/clinical-trials-started-per-year","csv_url":"https://chart.ly/charts/clinical-trials-started-per-year/data.csv","image_url":"https://chart.ly/charts/clinical-trials-started-per-year/image.png","embed_url":"https://chart.ly/charts/clinical-trials-started-per-year/embed","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-started-per-year)","credit_html":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via \u003ca href=\"https://chart.ly/charts/clinical-trials-started-per-year\"\u003eChartly\u003c/a\u003e","average_label":null,"zero_axis":true,"data":[{"label":"2000","value":1876},{"label":"2001","value":2407},{"label":"2002","value":3497},{"label":"2003","value":4770},{"label":"2004","value":6320},{"label":"2005","value":7729},{"label":"2006","value":9299},{"label":"2007","value":10422},{"label":"2008","value":11900},{"label":"2009","value":12849},{"label":"2010","value":13420},{"label":"2011","value":14216},{"label":"2012","value":15028},{"label":"2013","value":15896},{"label":"2014","value":17602},{"label":"2015","value":18951},{"label":"2016","value":20371},{"label":"2017","value":21265},{"label":"2018","value":22875},{"label":"2019","value":23834},{"label":"2020","value":23603},{"label":"2021","value":28352},{"label":"2022","value":28123},{"label":"2023","value":29515},{"label":"2024","value":30727},{"label":"2025","value":31116}],"annotations":[]},"docs":"https://chart.ly/developers","terms":"Free to use with credit: wherever you show or quote a chart's data, name Chartly with a link to that chart's url (each chart's credit line does both) and credit its source as its license asks.","credit":"ClinicalTrials.gov (U.S. National Library of Medicine), counted with its API v2, via Chartly (https://chart.ly/charts/clinical-trials-started-per-year)"}