Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.12641 -0.03377 -0.01357  0.03019  0.22843 

Coefficients:
             Estimate Std. Error t value             Pr(>|t|)    
(Intercept)  0.133766   0.010080  13.270 < 0.0000000000000002 ***
xAmericas   -0.033064   0.016589  -1.993              0.04815 *  
xAsia       -0.007356   0.014972  -0.491              0.62394    
xEurope     -0.099978   0.014345  -6.970       0.000000000106 ***
xOceania    -0.060716   0.022765  -2.667              0.00853 ** 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.06455 on 144 degrees of freedom
Multiple R-squared:  0.2946,	Adjusted R-squared:  0.275 
F-statistic: 15.03 on 4 and 144 DF,  p-value: 0.0000000002723