Genoa, it reaches almost 500 inhabitants per km2, whereas in the provinces of Imperia and Savona it is less than 200 inhabitants per km2. The Spanish traveller Pedro Tafur, noting it from sea in 1436, remarked "To one who does not know it, the whole coast from Savona to Genoa looks like one continuous city, so well inhabited is it, and so thickly studded with houses," and today over 80% of the regional population still lives permanently near to the coast, where all the four major cities above 50,000 are located: Genoa (pop. 610,000), La Spezia (pop. 95,000), Savona (pop. 62,000) and Sanremo (pop. 56,000). The population of Liguria has been declining from 1971 to 2001, most markedly in the cities of Genoa, Savona and La Spezia. The age pyramid now looks more like a 'mushroom' resting on a fragile base. The negative trend has been partially interrupted only in the last decade when, after a successful economic recovery, the region has attracted consistent fluxes of immigrants. , the Italian national institute of statistics, ISTAT, estimated that 90,881 foreign-born immigrants live in Liguria, equal to 5.8% of the total regional population. Economy Ligurian agriculture has increased its specialisation pattern in high-quality products (flowers, wine, olive oil) and has thus managed to maintain the gross value-added per worker at a level much higher than the national average (the difference was about 42% in 1999). The value of flower production represents over 75% of the agriculture sector turnover, followed by animal farming (11.2%) and vegetable growing (6.4%). 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 production. So the Ligurian industry has turned towards a widely diversified range of high-quality and high-tech products (food, shipbuilding, electrical engineering and electronics, petrochemicals, aerospace etc.). Nonetheless, the region 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. Transport A good motorways network ( 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