20172016201520142013
North America69.7%68.6%64.9%64.0%68.5%
United Kingdrom7.7%8.7%10.7%10.6%10.0%
Continental Europe18.3%18.1%19.7%20.2%17.4%
Other Region4.4%4.7%4.7%5.2%4.1%