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the lower 4% turnout is a mistype in the source, i know this is orignal work but if the 1987 turnout is 73% with 2.2 mil. voters, the 1990/91 turnout is around 50% with 1.6 mil. the 1988 1 mil. of voters is not lower of 4% but lower of 40% — Preceding unsigned comment added by 79.19.209.216 (talk) 20:27, 6 October 2021 (UTC)[reply]
So, I did initially think you were probably correct, as the IDEA confirm that turnout was only 36% of the voter age population, which makes 40% make sense.
However, there are also many sources that refer to turnout being extremely low, such as this.
Based on this, the answer appears to be that the 'official' result figures were inflated and it was estimated by observers that the real turnout was the very low one. I will update the article to reflect this. Cheers, Number57 21:47, 6 October 2021 (UTC)[reply]