Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.116094 -0.049376 -0.009405  0.030018  0.209850 

Coefficients:
             Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.108713   0.011068   9.822 < 0.0000000000000002 ***
xAmericas   -0.051532   0.018215  -2.829              0.00534 ** 
xAsia        0.007388   0.016439   0.449              0.65379    
xEurope     -0.099291   0.015751  -6.304        0.00000000334 ***
xOceania    -0.015858   0.024996  -0.634              0.52681    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.07087 on 144 degrees of freedom
Multiple R-squared:  0.2839,	Adjusted R-squared:  0.264 
F-statistic: 14.27 on 4 and 144 DF,  p-value: 0.0000000007722