8,600,000 (1859), 12,923,600 (1912), 18,052,896 (1930), 15,872,624 (1948), 17,489,450 (1956), 19,103,163 (1966), 21,559,910 (1977).   Currency: Lei (Ron)   LANGUAGE/S Romanian. Other languages, such as Hungarian , German , Romani , Ukrainian and Serbian , are official at various local levels. CUSTOMS, TRADITIONS The culture of Romania is rich and varied.