For nearly 40 years, the Western Interstate Commission for Higher Education (WICHE) has produced projections of high school graduates. The purpose of "Knocking at the College Door: Projections of High School Graduates" is to equip decision-makers at all levels with information about how the numbers of high school graduates are likely to change in the years ahead. These projections inform a broad audience; stakeholders including policymakers, elected officials and their staffs, state departments of education and higher education, postsecondary system heads, K-12 and school district leaders, administrators at public and private colleges and universities, researchers, policy organization staff, media, and others rely on them for a broad variety of uses. This 9th edition of "Knocking at the College Door" spans school years 2000-01 through 2031-32. As in previous editions, it examines data on public and private schools and projects the number of high school graduates for the nation, four geographic regions, the 50 states, and the District of Columbia. For the first time, WICHE also includes projections for Guam and Puerto Rico. Finally, "Knocking" also presents projections for public high school graduates, disaggregated by race/ethnicity. The following are appended: (1) High School Graduate Data Tables; (2) High School Enrollment Data Tables; and (3) Technical Information and Methodology. [For the 8th edition of this report, see ED540129.]