Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.066438 -0.027690 -0.005418  0.009335  0.259281 

Coefficients:
             Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.066442   0.006981   9.518 < 0.0000000000000002 ***
xAmericas   -0.030501   0.011488  -2.655             0.008822 ** 
xAsia       -0.038729   0.010368  -3.735             0.000269 ***
xEurope     -0.061007   0.009934  -6.142        0.00000000755 ***
xOceania    -0.049705   0.015764  -3.153             0.001967 ** 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.0447 on 144 degrees of freedom
Multiple R-squared:  0.2177,	Adjusted R-squared:  0.1959 
F-statistic: 10.02 on 4 and 144 DF,  p-value: 0.0000003514