Detailed Instructions: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Q: Passage: Under the terms of the Scotland Act 1978, an elected assembly would be set up in Edinburgh provided that the majority of the Scottish electorate voted for it in a referendum to be held on 1 March 1979 that represented at least 40% of the total electorate. The 1979 Scottish devolution referendum to establish a devolved Scottish Assembly failed. Although the vote was 51.6% in favour of a Scottish Assembly, this figure did not equal the 40% of the total electorate threshold deemed necessary to pass the measure, as 32.9% of the eligible voting population did not, or had been unable to, vote. Question: What percentage of Scotland's voting population failed to actually vote?
A:
32.9%