Koptelefoons
45%
23%
21%
5%
13%
24%
17%
3%
10%
8%
20%
50%
33%
29%
20%
51%
63%
30%
41%
14%
38%
35%
5%
24%
31%
5%
12%
17%
22%
24%
31%
5%