In 2013, Washington University received a record 30,117 applications for a freshman class of 1,500 with an acceptance rate of 13.7%. More than 90% of incoming freshmen whose high schools ranked were ranked in the top 10% of their high school classes. In 2006, the university ranked fourth overall and <answer>second among private universities</answer> in the number of enrolled National Merit Scholar freshmen, according to the National Merit Scholar Corporation's annual report. In 2008, Washington University was ranked #1 for quality of life according to The Princeton Review, among other top rankings. In addition, the Olin Business School's undergraduate program is among the top 4 in the country. The Olin Business School's undergraduate program is also among the country's most competitive, admitting only 14% of applicants in 2007 and ranking #1 in SAT scores with an average composite of 1492 M+CR according to BusinessWeek.
Where did Washington University rank among private universities for National Merit Scholar freshman in 2006?
second among private universities