Koptelefoons
28%
33%
23%
41%
20%
28%
40%
21%
16%
10%
10%
24%
51%
20%
28%
34%
9%
21%
17%
17%
1%
10%
10%
24%
33%
10%
41%
13%
18%
16%
51%
10%
13%
32%
40%