Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.032998 -0.018479 -0.011176  0.009807  0.297614 

Coefficients:
              Estimate Std. Error t value             Pr(>|t|)    
(Intercept)   0.032999   0.002064  15.985 < 0.0000000000000002 ***
xNA          -0.006189   0.007493  -0.826                0.409    
xnon-Annex I -0.014515   0.002679  -5.417          0.000000083 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.03454 on 709 degrees of freedom
Multiple R-squared:  0.03989,	Adjusted R-squared:  0.03718 
F-statistic: 14.73 on 2 and 709 DF,  p-value: 0.0000005405