Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.020516 -0.011943 -0.007969  0.002260  0.221822 

Coefficients:
             Estimate Std. Error t value         Pr(>|t|)    
(Intercept)  0.016001   0.002290   6.988 0.00000000000647 ***
xAmericas    0.004517   0.003206   1.409          0.15928    
xAsia       -0.002986   0.003164  -0.944          0.34562    
xEurope     -0.007692   0.002749  -2.798          0.00529 ** 
xOceania    -0.004046   0.004023  -1.006          0.31491    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.02519 on 707 degrees of freedom
Multiple R-squared:  0.0309,	Adjusted R-squared:  0.02542 
F-statistic: 5.636 on 4 and 707 DF,  p-value: 0.000181