20152014201320122011
United States71.6%69.6%70.2%72.7%70.4%
ItalyN/AN/A6.0%6.0%6.8%
GermanyN/AN/A4.8%0.0%0.0%
CanadaN/AN/A4.8%5.2%5.3%
FranceN/AN/A4.2%4.1%4.4%
Other internationalN/AN/A10.1%12.0%13.0%