E-book sales reached 20% of total U.S. book sales in 2011- a total of $970 million. Book sales in paper copies were a bit lower than $5 billion in 2011, close to where they were in 2011, showing that book sales have not fallen as e-book sales have increased. This is based on figures from the monthly industry reports of the Association of American Publishers. The Justice Department's antitrust lawsuit against Apple and five publishers for price collusion is having a serious impact on Barnes & Noble, as Barnes & Noble's made a profit of about 30% or $3.90 under the pricing model Apple helped establish, where the e book title sold for $12.99. In a lower pricing arrangement Amazon establishes Barnes & Noble's profits would decline substantially or even lead to a loss. Barnes & Noble's stock lost 17% in April, 2012.