Until April 1981, only selling rates were published by the Danmarks Nationalbank; from May 1981 middle rates were published instead. Until 1998, buying and middle rates/buying and selling rates were calculated by the commercial banks on the basis of fixed margins; 40 øre until 28 February 1979, 35 øre until 30 June 1994 and 55 øre from 1 July 1994 (using the middle rate in each case).
