TO GO WITH AFP STORY CROATIA-TURISM by Lajla Veselica Picture taken August 1, 2011 shows naturist camp Koversada near the Croatian northern Adriatic town of Vrsar. It is estimated that some 15 percent of more than 10 million tourists that visit Croatia each year occasionally enjoy the beauty of the sea and sun without a bathing suit. The tourism industry is the key sector of Croatia's recession-hit economy and it makes up around 18 percent of its gross domestic product (GDP). Croatia was Europe's first country to open a commercial naturist resort -- the Koversada camp in the northwestern Istria peninsula, that this year marks its 50th anniversary. AFP PHOTO/ HRVOJE POLAN (Photo credit should read HRVOJE POLAN/AFP/Getty Images)