railway referendum
... that only 20.5 percent of registered Slovenians turned out to vote in a 2017 railway referendum?
... that only 20.5 percent of registered <a href="./Slovenia" id="mwBAg" rel="mw:WikiLink" title="Slovenia">Slovenians</a> turned out to vote in a 2017 <b id="mwBAk"><a class="mw-redirect" href="./Slovenian_railway_referendum,_2017" id="mwBAo" rel="mw:WikiLink" title="Slovenian railway referendum, 2017">railway referendum</a></b>?