For European car makers Volvo, BMW and Rolls-Royce, HD Radio is a standard feature in a number of their automotive lines. Since its debut in the US in 2005 in just two car models, HD Radio has expanded in five years to 15 brands, and it is found standard in 36 model lines, while being an option package for 50 additional model lines. However, Asian automakers have been reluctant to include HD Radio in their car models. CNET reports just one Japanese car maker, Toyota, has incorporated HD Radio into their model lines, and that is in the Scion. Overall, HD Radio sales for cars have increased from 57,000 n 2008, to 438,000 for the 12-month period ending June 30, 2010. CNET cites lower cost as one reason for increased sales, with HD car radio units costing $150 to $200 five or six years ago to just $30 – or even free – now. They also cite increased HD signal coverage areas, and more stations adding HD radio signals, as well as the better sound quality. iBiquity Digital CEO Bob Struble says they haven’t hit their peak yet, saying “We need to be 5, 10 or 15 million” to achieve HD Radio critical mass.