Jim had a collection of 24 state quarters. He poured 10 of them onto the table and noticed the years that the quarters were produced,
as shown below.
2004, 2006, 2009, 2003, 2001, 2001, 2006, 2006, 2004, 2003
Assuming that the sample was representative of the collection, what was the mode of the year that the quarters were produced?