Which referendum in Ireland, following the Eighth Amendment of the Constitution of Ireland, has the least amount of spoiled votes?
select ?ent where { ?ent wdt:P31 wd:Q54086790 . ?ent wdt:P5044 ?obj . ?ent wdt:P155 wd:Q4126745} ORDER BY ASC(?obj)LIMIT 5 
referendums in ireland: Q54086790 eighth amendment of the constitution of ireland: Q4126745