Passage: The ninth congress, which opened on March 26, began with an extraordinary session of the Congress of People's Deputies taking up discussions of emergency measures to defend the constitution, including impeachment of President Yeltsin. Yeltsin conceded that he had made mistakes and reached out to swing voters in parliament. Yeltsin narrowly survived an impeachment vote on March 28, votes for impeachment falling 72 short of the 689 votes needed for a 2/3 majority. The similar proposal to dismiss Ruslan Khasbulatov, the chairman of the Supreme Soviet was defeated by a wider margin (339 in favour of the motion), though 614 deputies had initially been in favour of including the re-election of the chairman in the agenda, a tell-tale sign of the weakness of Khasbulatov's own positions (517 votes for would have sufficed to dismiss the speaker).By the time of the ninth Congress, the legislative branch was dominated by the joint communist-nationalist Russian Unity bloc, which included representatives of the CPRF and the Fatherland faction (communists, retired military personnel, and other deputies of a socialist orientation), Agrarian Union, and the faction "Russia" led by Sergey Baburin. Together with more 'centrist' groups (e.g. 'Change' (Смена)), the Yeltsin supporters ('Democratic Russia', 'Radical democrats') were clearly left in the minority.

Question: By how many votes did Yeltsin survive an impeachment?
72