单项选择题

Northern Europeans are willing to pay a lot of money and put up with a lot of inconveniences for the sun because they have so little of it. Residents of cities like London, Copenhagen, and Amsterdam spend a lot of their winter in the dark because the days are so short, and much of the rest of the year is in the rain. This is the reason the Mediterranean has always attracted them. Every summer, more than 25 million people travel to Mediterranean resorts and beaches for their vacation. They all come for the same reason : sun !
The huge crowds mean lots of money for the economies of Mediterranean countries. Italy’s 30, 000 hotels are booked solid every summer. And 13 million people camp out on French beaches, parks, and roadsides. Spain’s long sandy coastline attracts more people than anywhere else. 37 million tourists visit yearly ,or one tourist for every person living in Spain.
How large is probably the Spanish population