Number of cases


Number of nations in which average happiness was assessed in general population samples

1946 - 1955
8
1956 - 1965
20
1966 - 1975
30
1986 - 1955
48
1996 - 2000
65
1990 - 2000
90
1995 - 2005
95
2006 -
135

An overview of nations and questions used per era is on the case list


States of Nations is an inventory of country characteristics. It is part of the World Database of Happiness.