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Question: Thinking about yourself and how you normally feel: how often do you feel as described below? - Happy
Choices: "Never" "Rarely" "Sometimes" "Always"
Data: % of "Sometimes" "Always"
Period:
Area:
9 countries/ areas
Highlight:
1 France 93.5%
2 Canada93.2%
3 United States92.9%
4 United Kingdom92.6%
5 Germany91.8%
6 Italy91.2%
6 Japan91.2%

Source
PISA 2018 Results (Volume III) : What School Life Means for Studentsf Lives

Correlations with major national performance indices
Life satisfaction (10 steps)
No. of data7
Regression equation
Y = 23.211733 X -14.851
Correlation coefficient (r)0.754
Coefficient of determination (R2)0.569

GDP per capita (current US$)
No. of data7
Regression equation
Y = 861921.333333 X -745188.643
Correlation coefficient (r)0.527
Coefficient of determination (R2)0.278

Life expectancy at birth - Both sexes (years)
No. of data7
Regression equation
Y = -102.933333 X +176.566
Correlation coefficient (r)-0.462
Coefficient of determination (R2)0.213

Fertility rate, total (births per woman)
No. of data7
Regression equation
Y = 16.720000 X -13.965
Correlation coefficient (r)0.746
Coefficient of determination (R2)0.557

Suicide, age-standardized (per 100 000 population)
No. of data7
Regression equation
Y = 120.512000 X -101.824
Correlation coefficient (r)0.337
Coefficient of determination (R2)0.114