SYDNEY--Asian millionaires outnumbered those in other regions of the world for the first time on record last year even as Europe's debt crisis contributed to an overall drop in wealth, according to a study published on Wednesday.

The number of people with at least $1 million in investable assets in Asia Pacific rose by 1.6% to a record 3.37 million in 2011, as economic growth outstripped growth in more developed regions including Europe and North America, the annual wealth survey by Capgemini SA and RBC Wealth Management found.

By contrast, so-called high-net-worth individuals in the U.S. fell by 1.1% to 3.35 million during the year.

China and Japan were the biggest contributors to Asia's growing wealth pool, accounting for around 70% of the region's millionaires. That was despite concern over slowing growth in both economies and a natural disaster last year.

"If you look at the fact that Japan had the nuclear meltdown and the earthquake last year, I expected it would be rebuilding itself," said Dorus van den Biezenbos, a wealth-management specialist at CapGemini in Australia, in an interview. "But it's because of the rebuilding, and the government stimulus, that there have been entrepreneurs who have capitalized on that."

The number of millionaires worldwide remained reasonably constant at around 11 million, the survey of 71 countries representing 98% of the world's gross national income found.

Still, for the first time since the survey was started 16 years ago, the average holdings of the global rich decreased as the overall wealth pool fell by 1.7% to $42 trillion last year--the first such decline since the 2008 global financial crisis.

Mr. van den Biezenbos said the ultra-rich, defined as people with investable assets of more than $30 million, had seen the largest drop in their wealth, as many had invested in long-term vehicles, such as hedge funds, that have suffered since the financial crisis.

"People always say the rich get richer and the poor get the picture, but this year that hasn't been the case," he said.

In crisis-hit Europe, growing wealth in Russia, the Netherlands and Switzerland boosted the number of millionaires to 3.17 million, while their total assets decreased by 1.1% to $10.1 trillion. Even in France and Germany, the region's largest economies, the numbers of rich increased last year.

"These millionaires usually diversify quite substantially" and invested more in lower-yielding but relatively safer assets, such as fixed-income and term deposits, Mr. van den Biezenbos said.

"Therefore, they have been able to take advantage of opportunities elsewhere outside Europe," he added.

North America remained the richest region globally with $11.4 trillion in high-net-worth assets, outstripping Asia Pacific with $10.7 trillion. The U.S., Japan and Germany remain the world's wealthiest nations, accounting for more than half of the world's high-net-worth population.

Write to Caroline Henshaw at caroline.henshaw@wsj.com

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