The spoken-word audiobook market grew again in 2007, with sales up 12%, to just over $1 billion, and the percentage of adults who now listen to audiobooks increased from 25% in 2006 to 28% last year, according to the Audio Publishers Association's annual sales and consumer surveys. Sales of CDs and downloads increased in the year, while sales of cassettes declined. CDs represented 78% of audiobook sales (about $806 million) in 2007, with downloads comprising 17% (approximately $175 million), up from 14% in 2006. The market share of cassettes was 3% in 2007, down from 7% in 2006. The library was the most popular place for consumers to get audiobooks, while retail bookstores was the largest sales channel.