sentences:  In 1960, Mallorca received 500,000 visitors, in 1997 it received more than 6,739,700.In 2001 more than 19,200,000 people passed through "Son Sant Joan" airport near Palma, with an additional 1.5 million coming by sea.In the 21st century, urban redevelopment, by the so-called "Pla Mirall" (English "Mirror Plan"), had attracted groups of immigrant workers from outside the European Union, especially from Africa and South America.