Your query included the range "1987 2011". This is likely because the film is a nostalgic look back by a director from 2011.
Unlike mainstream Spanish films (e.g., Almodóvar’s works), Madrid, 1987 did not receive a wide international Blu-ray release with forced English subtitles. Here is why the keyword "madrid 1987 2011 subtitles english" is searched so frequently: madrid 1987 2011 subtitles english
Many users report that the official DVD release in Spain (title: Madrid, 1987) does not include English subtitles at all. The US DVD from Tribeca does, but it is out of print. On torrent sites, you often find a 720p or 1080p rip with “hard-coded” Spanish subs or no subs at all. This is why the specific search for English subtitles (usually in .srt or .ass format) is so common. Your query included the range "1987 2011"