The institution comprises 16 colleges, a graduate school, 93 undergraduate programs, 99 master programs, 66 doctoral programs, and four professional programs. The University of Kentucky has fifteen libraries on campus. The largest is William T. Young Library, a federal depository, hosting subjects related to social sciences, humanities and life sciences collections. In recent years, the university has focused expenditures increasingly on research, following a compact formed by the Kentucky General Assembly in 1997. The directive mandated that the university become a Top 20 public research institution, in terms of an overall ranking to be determined by the university itself, by the year 2020