Vienna, Austria’s capital, is an important economic and transport link between Western and Central Europe. With just one-fifth of the country’s population, in 2005 Vienna contributed around 27% of Austrian GDP. The backbone of Vienna’s economy is formed by small and medium-sized enterprises, which account for a staggering 98% of Vienna’s enterprises. The city has seen a structural shift from manufacturing to business-related services over the past decade. Still, Vienna’s manufacturing industry accounted for around 16% of the city’s gross value added in 2007, with the primary exports being machinery and vehicles, chemicals and plastics, and agricultural products. Financial services, insurance and tourism are also important industries in Vienna. Vienna ranks fourth overall in the European Green City Index, with a score of 83.34 out of 100, behind Copenhagen, Stockholm and Oslo. Vienna performs particularly well in the water category, and also scores high for use and development of renewable energy.