1984: First version in books: ‘Conditions of Happiness‘, and related ‘Databook of Happiness‘
1990: Second version in books: ‘Bibliography of Happiness‘, ‘Happiness in Nations‘, ‘Correlates of Happiness‘
1994: Initial Web-site (FTP platform)
1998: First website with on-line facilities, now available at https://worlddatabaseofhappiness-archive.eur.nl
2001: Collection ‘Measures of Happiness‘ added
2003: Finding Reports added
2003: Data file ‘States of Nations‘ added
2005: Data file ‘Trends in Nations‘ added. Maps added
2010: Collection ‘Happiness in Regions‘ added, as part of happiness in Nations
2013: Integration of the basic Access data files in one
2016: MsAccess database linked to MsAzure
2020: Revision of website: New format, search tools added
Last update: 1-8-2021