The NBA Draft is an annual North American event in which the National Basketball Association's (NBA) thirty teams (29 in the United States and one in Toronto, Canada) can select players who wish to join the league. These players usually come from the college level, but in recent drafts a greater number of international and high school players have been drafted. As of the 2006 NBA Draft, high school players gain eligibility for draft selection one year after their graduating class has finished high school, but only if they also are at least 19 years of age as of the end of the calendar year of the draft.