Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.23694 -0.02240 -0.01036 -0.00176  0.54299 

Coefficients:
                     Estimate Std. Error t value           Pr(>|t|)    
(Intercept)          0.044377   0.016892   2.627             0.0088 ** 
xCaribbean          -0.034873   0.020826  -1.675             0.0945 .  
xCentral America    -0.019449   0.019636  -0.990             0.3223    
xCentral Asia       -0.044269   0.026410  -1.676             0.0941 .  
xEastern Africa     -0.031115   0.019177  -1.623             0.1052    
xEastern Asia       -0.024512   0.020688  -1.185             0.2365    
xEastern Europe     -0.038799   0.019444  -1.995             0.0464 *  
xMelanesia          -0.026801   0.023079  -1.161             0.2459    
xMicronesia         -0.032963   0.023079  -1.428             0.1537    
xMiddle Africa      -0.042609   0.023889  -1.784             0.0749 .  
xNA                  0.085958   0.021133   4.067 0.0000530271301321 ***
xNorthern Africa    -0.038176   0.025618  -1.490             0.1366    
xNorthern America    0.202288   0.026410   7.660 0.0000000000000634 ***
xNorthern Europe    -0.000946   0.018213  -0.052             0.9586    
xPolynesia          -0.041787   0.023079  -1.811             0.0706 .  
xSouth America      -0.033637   0.018782  -1.791             0.0737 .  
xSouth-Eastern Asia -0.018817   0.019226  -0.979             0.3281    
xSouthern Africa    -0.005718   0.024381  -0.235             0.8146    
xSouthern Asia      -0.037237   0.020560  -1.811             0.0706 .  
xSouthern Europe    -0.014580   0.018815  -0.775             0.4387    
xWestern Africa     -0.039695   0.019386  -2.048             0.0410 *  
xWestern Asia       -0.037603   0.020560  -1.829             0.0678 .  
xWestern Europe     -0.021977   0.018262  -1.203             0.2292    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.0609 on 689 degrees of freedom
Multiple R-squared:  0.246,	Adjusted R-squared:  0.2219 
F-statistic: 10.22 on 22 and 689 DF,  p-value: < 0.00000000000000022