Steel, once a major industry during the booming 1950s and 1960s, phased out after the late 1980s crisis, as Italy moved away from the heavy industry to pursue more technologically advanced and less polluting productions. So the Ligurian industry has turned towards a widely diversified range of high-quality and high-tech products (food, shipbuilding (in Sestri Ponente and in metropolitan area - Sestri Levante), electrical engineering and electronics, petrochemicals, aerospace etc. ). Nonetheless, the regions still maintains a flourishing shipbuilding sector (yacht construction and maintenance, cruise liner building, military shipyards). In the services sector, the gross value-added per worker in Liguria is 4% above the national average. This is due to the increasing diffusion of modern technologies, particularly in commerce and tourism. A good motorway network (376 km (234 mi) in 2000) makes communications with the border regions relatively easy. The main motorway is located along the coastline, connecting the main ports of Nice (in France), Savona, Genoa and La Spezia. The number of passenger cars per 1000 inhabitants (524 in 2001) is below the national average (584). On average, about 17 million tonnes of cargo are shipped from the main ports of the region and about 57 million tonnes enter the region. The Port of Genoa, with a trade volume of 58. 6 million tonnes ranks first in Italy, second in terms of twenty-foot equivalent units after the transshipment port of Gioia Tauro, with a trade volume of over 2 million TEUs. The main destinations for the cargo-passenger traffic are Sicily, Sardinia, Corsica, Barcelona, and the Canary Islands.