u.s . uncoated papers net sales in 2006 were $ 3.5 billion , compared with $ 3.2 billion in 2005 and $ 3.3 billion in 2004 . sales volumes increased in 2006 over 2005 , particularly in cut-size paper and printing papers . average sales price realizations increased significantly , reflecting benefits from price increases announced in late 2005 and early 2006