Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.15958 -0.05248 -0.01409  0.04012  0.31190 

Coefficients:
            Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.15960    0.01297  12.303 < 0.0000000000000002 ***
xAmericas   -0.06402    0.02135  -2.999              0.00319 ** 
xAsia       -0.02672    0.01927  -1.387              0.16771    
xEurope     -0.10373    0.01846  -5.619         0.0000000962 ***
xOceania    -0.08719    0.02930  -2.976              0.00342 ** 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.08306 on 144 degrees of freedom
Multiple R-squared:  0.2042,	Adjusted R-squared:  0.1821 
F-statistic: 9.238 on 4 and 144 DF,  p-value: 0.000001132