Berkeley receives funding from a variety of federal, state, and private sources. With the exception of government contracts, public support is apportioned to Berkeley and the other campuses of the University of California system through the UC Office of the President and accounts for some 12 percent of Berkeley's total revenues. Berkeley has long benefited from private philanthropy, with considerable gifts from the Flood, Hearst, Durant, Strauss, Lick, Harmon, and Bacon families in the 19th century and from the Hearst, Doe, Sather, Rockefeller, Cowell, Haviland, Bowles, Boalt, and Stern families, among others, in the first half of the 20th century. More recently, alumni and their foundations have given to the university for operations and capital expenditures.