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Figure 4: The number of unit sales for all portable audio devices for the ten countries and for the EU,

adjusted according to the internet users in each country as estimated by EuroStat.

The number of unit sales (in thousands) for all portable audio devices for the
                    ten countries and for the EU

Source: SCENIHR,  Potential health risks of exposure to noise from personal music players and mobile phones including a music playing function (2008) , Sections 3.7.4., Page 46.