Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.24246 -0.05508 -0.02297  0.05136  0.41711 

Coefficients:
               Estimate  Std. Error t value             Pr(>|t|)    
(Intercept)  0.24247918  0.01568235  15.462 < 0.0000000000000002 ***
xAmericas   -0.08459597  0.02580846  -3.278              0.00131 ** 
xAsia        0.00003223  0.02329176   0.001              0.99890    
xEurope     -0.19926956  0.02231637  -8.929  0.00000000000000183 ***
xOceania    -0.07657455  0.03541573  -2.162              0.03226 *  
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.1004 on 144 degrees of freedom
Multiple R-squared:  0.4175,	Adjusted R-squared:  0.4014 
F-statistic: 25.81 on 4 and 144 DF,  p-value: 0.0000000000000003904