Task: Question Generation
Input (English): Passage: National Council In the 2015 Swiss federal election, 2015 the most popular party was the Swiss Peoples Party with 25.4% of the vote. The next three most popular parties were the Christian Democratic Peoples Party of Switzerland (22.5%), the FDP.The Liberals (19.5%) and the Social Democratic Party of Switzerland (17.2%). In the federal election, a total of 9,438 votes were cast, and the voter turnout was 55.4%. The 2015 election saw a large change in the voting when compared to 2011. The percentage of the vote received by the SP increased sharply from 6.4% in 2011 to 17.2% in 2015, while the percentage that the Green Party of Switzerland received dropped from 21.3% to 9.5%.
Output (English): How many percent of the population did not vote?