I want to know the answer to the following question:
Approximately what percentage of the hard drive-based music player sales does iPod have since 2004?
All the background I'm provided with is that "Since October 2004, the iPod line has dominated digital music player sales in the United States, with over 90% of the market for hard drive-based players and over 70% of the market for all types of players.". Is that enough to answer the question?
Answer: yes