Depends on school (eg institutional strength)
Yale (top degrees): Economics, Comp Sci, Political Science, History
(least subscribed): Earth and planetary Sciences Germanic Literature, Romance Languages & Literature, African American Studies, Women, Gender, and Sexual Studies
Harvard (top degrees): Economics, Government/Poli Sci, Computer Science, History, Social Sciences, and Biology.
(least subscribed): South Asian Studies, Religion, Myth/Folklore, Germanic Language/Studies, African American Studies