Spanish agriculture has traditionally been most affected by the level of rainfall, since drought is always a threat. However, in recent years a much more decisive factor has been the Spanish membership in the EC/EU. While encouraging production in some agricultural sectors, the EU has discouraged it in others. Small farms have been closed down, with grape growers and dairy farmers the hardest hit. In 1999 a EU reform of the Common Agricultural Policy was approved as part of the "Agenda2000." The reform mandated that at least 10 percent of land be set aside until 2006 in order to avoid overproduction. In spite of this limitation, the abundance of Spain's agricultural resources guarantees overall growth.