统计数据在这

1	Princeton	6
2	Harvard	4
3	Yale	4
3	Chicago	6
5	Columbia	4
5	Stanford	5
7	MIT	8
8	Pennsylvania	6
8	Duke	7
10	John Hopkims	3
Top 10 Total
	Attend rate: (total students)
11	Dartmouth
12	CIT	1
12	Northwestern
14	Brown	3
15	Cornell	13
15	Notre Dame	3
15	Rice	3
15	Vanderbilt	3
19	Washinton St.Louis	4
20	Berkeley	11
20	Emory	1
20	Georgetown	5
Top 20 Total
	Attend rate: (total students)
23	South California	4
24	Carnegie Mellon	15
24	UCLA	2
24	Virginia	62
27	Michigan	16