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Number of nations per era in data file ‘States of Nations’

Number of nations in which average happiness was assessed in general population samples and on which data on nation characteristics are available in this collection

1946 – 19558
1956 – 196520
1966 – 197530
1976 – 198548
1986 – 199565
1996 – 200595
2006 – 2015135
2016 – 2025