Call:
lm(formula = f, data = d)

Residuals:
    Min      1Q  Median      3Q     Max 
-22.432  -4.915   0.043   6.222  20.899 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)    
(Intercept) -22.3482     5.0070  -4.463 1.43e-05 ***
gdp           7.0974     0.5101  13.913  < 2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 8.023 on 177 degrees of freedom
Multiple R-squared:  0.5224,	Adjusted R-squared:  0.5197 
F-statistic: 193.6 on 1 and 177 DF,  p-value: < 2.2e-16