SOCAT data are released in versions. Each succeeding version contains new data sets as well as updates of older ones. The first version of SOCAT was released in 2011, the second and third version followed biennially. Automation allowed annual public releases since version 4. The latest SOCAT version is version 2021.
|Release Year||# fCO₂ values (millions)||Time span|
|Version 6||Data Access||2018||23.4||1957-2017|
|Version 5||Data Access||2017||21.5||1957-2017|
|Version 4||Data Access||2016||18.5||1957-2015|
|Version 3||Data Access||2015||14.5||1957-2014|
|Version 2||Data Access||2013||10.1||1968-2011|
|Version 1.5||Data Access||2011||6.3||1968-2007|