Denmark has twice disrupted EU plans: in 1992, the Danes voted against ratification of the Treaty of Maastricht, but approved it after the Danish Government renegotiated its terms to secure Danish opt-outs from some of its provisions; in 2000 in another referendum, Denmark decided by a small majority not to join the euro, but since then, the Danmarks Nationalbank has maintained a fixed exchange rate between the Danish Kroner and the euro.