European Commission proposal to be approved. This increases to 72% of voting members states, representing at least 65% of the EU population of voting members should the proposal originate from a member state. Proposals can be blocked should a qualified majority of least four Council members representing more than 35% of the EU population be formed. Finland Changing the constitution of Finland requires that a simple majority of the sitting Parliament vote in favor of the amendment. The amendment is postponed until the next general election. The next parliament may finally vote to ratify the amendment but by a two thirds of the MPs. Thus, a double majority of two different parliaments is usually required to pass constitutional amendments. An expedited process may however be entered if five sixths of the sitting parliament vote to declare an amendment urgent. Then, a two-thirds majority of the current parliament may ratify an amendment using the expedited process. Montenegro When Montenegro voted for independence from Serbia, the EU insisted on a supermajority of 55% for it to recognise the result; this supermajority was akin to a double majority, and would avoid the endless debate that could have resulted if the result had a smaller majority. Northern Ireland Under the terms of the Belfast Agreement, if 30 members or more request it, a measure may be put to a "cross-community vote" which requires a majority from both the Nationalist and Unionist camps. Romania In Romania, a national referendum is considered valid only if at least 50% plus one of the registered voters cast their ballot. For a valid referendum, the outcome is determined by a simple majority of valid votes cast. The whole process thus involves a double majority in form of a quorum. A controversial amendment to the referendum law arose during the 2012 political crisis and allowed for an exception to be made in case of a referendum regarding the impeachment of the President. The original law, which required a double majority for impeachment, was modified by governmental emergency decree to circumvent the quorum requirement. This would have resulted in a successful impeachment of the President in the following referendum. The referendum was, however, subsequently invalidated by the Constitutional Court, the body responsible for overseeing the whole process, putting an end to the crisis. Sudan The independence referendum for South Sudan required 51% of the vote and 60% turnout. Switzerland In Switzerland,