In 2009, Internationale Outstanding University (IOU) had an enrollment of 25,422 undergraduates, each of whom paid $6,461 per year in tuition. In 2010, enrollment was 26,355 students, and tuition was raised 5.8%. In 2011, IOU received $186.8M in revenue from student tuition, and enrollment was 28,134 students. In 2012, it is estimated that tuition will be $7,011 and IOU needs to receive 5.7% more total revenue from tuition than in 2011.

What was the growth in enrollment in from 2009 to 2010?