20162015201420132012
United States70.5%71.6%68.8%67.8%65.6%
Japan10.3%9.2%10.3%11.9%14.6%
Germany10.0%9.6%11.0%11.3%11.2%
UK7.5%8.2%8.3%7.6%7.5%
Italy1.7%1.4%1.6%1.5%1.0%