Which one of the following countries had in 1994 voted against joining the European Union ?

In the 1994 referendums on accession to the European Union, Norway was the only one of the listed countries to vote against joining. An academic study of the 28 November 1994 Norwegian referendum reports that 52.2% of Norwegian voters rejected EU membership, noting that Finland and Sweden had held referendums that produced majorities in favor of accession, while Norway’s result remained opposed to joining. Contemporary news coverage similarly reported the narrow Norwegian “no” (roughly 52–53% against) and highlighted the contrast with the pro‑accession votes in other Nordic countries, confirming that Norway rejected EU membership in 1994.