New econ dept. ranking based on research output

Actually an update of this Tilburg-based ranking, based on research produced between 2007 and 2011.

Rank	University
1	HARVARD UNIVERSITY
2	UNIVERSITY OF CHICAGO
3	NEW YORK UNIVERSITY
4	UNIVERSITY OF CALIFORNIA, BERKELEY
5	MIT
6	STANFORD UNIVERSITY
7	COLUMBIA UNIVERSITY
8	YALE UNIVERSITY
9	NORTHWESTERN UNIVERSITY
10	UNIVERSITY OF PENNSYLVANIA
11	LSE
12	UNIVERSITY OF MICHIGAN
13	DUKE UNIVERSITY
14	UNIVERSITY OF OXFORD
15	PRINCETON UNIVERSITY
16	UNIVERSITY OF CALIFORNIA, LOS ANGELES
17	UNIVERSITY OF TORONTO
18	CORNELL UNIVERSITY
19	UNIVERSITY OF MARYLAND
20	UNIVERSITY OF CALIFORNIA, SAN DIEGO