Industry started to develop on a large scale only in the 20th century, but then grew rapidly, especially during the "Spanish miracle" period around the 1960s. The economy of the city was then centred on manufacturing industries such as those related to motor vehicles, aircraft, chemicals, electronic devices, pharmaceuticals, processed food, printed materials, and leather goods. Since the restoration of democracy in the late 1970s, the city has continued to expand. Its economy is now among the most dynamic and diverse in the European Union.