More than 2.5 million visitors to Australia travelled alone last year, an almost 20 per cent increase since 2000. What's more, a growing number of these intrepid solo travellers were women, latest figures from Tourism Research Australia show.

It's a trend that's happening around the world.

Recent figures from Britain indicate that 15.4 million Brits are planning to holiday alone this year, up from 9.6 million a decade ago, and the US Department of Commerce's data suggests more than 9 million women travelled alone outside the US in one year.

John Noake, manager of the Australian travel company Solo Traveller, said it was a growing trend in Australia.

"Since the beginning of 2005, when we began Solo Traveller, our single travel market has increased and women now make up over 70 per cent," he said.

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