20182017201620152014
United States45.9%53.6%54.8%54.6%53.2%
Other Americas9.2%8.9%10.5%11.4%12.4%
Europe32.1%23.1%21.2%18.9%18.5%
Asia5.1%6.3%6.1%8.0%8.1%
Middle East7.7%8.1%7.4%7.1%7.8%
Other0.0%-0.0%-0.0%0.0%0.0%