context: Washington University has been selected by the Commission on Presidential Debates to host more presidential and vice-presidential debates than any other institution in history. United States presidential election debates were held at the Washington University Athletic Complex in 1992, 2000, 2004, and 2016. A presidential debate was planned to occur in 1996, but owing to scheduling difficulties between the candidates, the debate was canceled. The university hosted the only 2008 vice presidential debate, between Republican Sarah Palin and Democrat Joe Biden, on October 2, 2008, also at the Washington University Athletic Complex.
question: వాషింగ్టన్ విశ్వవిద్యాలయంలో ఏయే సంవత్సరాల్లో అధ్యక్ష చర్చలు జరిగాయి?
answers: 1992, 2000, 2004, and 2016