Destinations around the world witnessed an estimated 494 million visitors in the first six months of 2013, representing an increase of 5 per cent or an additional 25 million international tourists compared to the same period of 2012, the UN agency said.
Asia-Pacific region witnessed the highest growth of 6.0 per cent, boosted by the increase in arrivals to South-East Asia, up by 12 per cent, followed by Europe at 5.0 per cent despite the lingering economic difficulties.
UNWTO Secretary-General, Taleb Rifai, said the growth in arrivals reflects growing importance of tourism sector.
"This underlines the need to rightly place tourism as one of the key pillars of socio-economic development, being a leading contributor to economic growth, exports and jobs," Rifai said.
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Emerging economy destinations saw stronger growth of 6 per cent, 2 per cent more than that by advanced economies, a trend which has marked the sector for many years now, it said.
The Middle East rebounded after two years of negative growth with an estimated increase in international arrivals of 13 per cent.
Emerging economy outbound markets continue to drive growth, it said, adding that China and Russia, which saw an increase of 31 per cent and 23 per cent respectively, led the growth in expenditure on travel abroad among the top ten most important source markets in the world.
Outside the top ten, Brazil is back with a 15 per cent increase after a more moderate 2012.
UNTWO has forecast that overall growth will amount to 4.0 per cent at the end of the year, with the first half expected to account for 45 per cent of the total arrivals.