All data is from the relevant issues of U.S. News & World Report.
The RANK AVERAGE (last column) is calculated for MBA programs that have ranked in the top fifty in at least seven of the nine U.S. News' rankings from April 2000 to April 2008. The rank average is just the average of the seven to nine rankings given.
THE TOP THREE MBA PROGRAMS from 2002 to the present have been, in some order, Harvard, Stanford, and U Pennsylvania. This is indicated by the pale blue color-coding
THE TOP FOUR THROUGH NINE MBA PROGRAMS from 2004 to the present have been, in some order, MIT, Northwestern, U Chicago, UC Berkeley, Dartmouth, and Columbia.
THE TOP TEN THROUGH SEVENTEEN MBA PROGRAMS from 2004 to the present, have been, in some order, New York University, UCLA, U Michigan, Yale, Duke, Virginia, Cornell, and Carnegie Mellon. This is indicated by the light green color-coding,
NO ROOM IN THE TOP SEVENTEEN. The top seventeen MBA programs have not changed since 2004.
ALMOST NO ROOM AT THE TOP. Since 2001 only 54 MBA programs have been in the top fifty; this is somewhat amazing considering that in April 2001, because of ties, 53 MBA programs were listed in the top fifty.