Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.52408 -0.10003  0.00599  0.07801  0.43615 

Coefficients:
            Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.37765    0.02577  14.656 < 0.0000000000000002 ***
xAmericas    0.12585    0.04240   2.968              0.00351 ** 
xAsia       -0.01604    0.03827  -0.419              0.67568    
xEurope      0.34388    0.03667   9.379 < 0.0000000000000002 ***
xOceania     0.03920    0.05819   0.674              0.50158    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.165 on 144 degrees of freedom
Multiple R-squared:  0.4556,	Adjusted R-squared:  0.4404 
F-statistic: 30.12 on 4 and 144 DF,  p-value: < 0.00000000000000022