 Complete the following phrase:  Bislett remained a speed skating venue until 1988, after which it only hosted athletics and football. Between 1925 and 1986, it saw 13 world championships and 10 European championships in speed skating. The structure was demolished and replaced with a new stadium in 2005. It hosts the annual Bislett Games, now part of the Diamond League in athletics. Marienlyst is used as a football stadium, and hosts both Strømsgodset IF and the Norway national under-21 football team. Lillestrøm, Dælenenga and Kadettangen are only used for lower-level football, as they lack any significant spectator stands. Jordal Amfi received a roof in 1972 and hosted the World Ice Hockey Championships in 1958 and 1999. Holmenkollbakken has been rebuilt several times since the Olympics; most recently it was entirely rebuilt in 2010. The complex has received a ski stadium, collectively known as Holmenkollen National Arena. In addition to the annual Holmenkollen Ski Festival, the hill hosted the FIS Nordic World Ski Championships in 