Schalke 04 has long been one of the most popular professional football teams and multi-sports club in Germany, even though major successes have been rare since the club's heyday in the 1930s and early 1940s. Schalke play in the Bundesliga, the top tier of the German football league system. As of December 2015, the club has 140,000 members, making it the second-largest sports club in Germany and the sixth-largest sports club in the world in terms of membership.