Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.062390 -0.022022 -0.007499  0.015709  0.117386 

Coefficients:
             Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.062399   0.005861  10.646 < 0.0000000000000002 ***
xAmericas   -0.014342   0.009646  -1.487                0.139    
xAsia       -0.012468   0.008705  -1.432                0.154    
xEurope     -0.054884   0.008341  -6.580       0.000000000813 ***
xOceania    -0.009298   0.013236  -0.702                0.484    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.03753 on 144 degrees of freedom
Multiple R-squared:  0.2535,	Adjusted R-squared:  0.2328 
F-statistic: 12.23 on 4 and 144 DF,  p-value: 0.00000001388