The rich are getting richer, according to the latest Wealth Report, a report on the world's super-rich published annually by property management firm, Knight Frank.

The number of ultra-high net worth individuals, or UHNWI, which the report defines as people with $30 million or more in net assets, increased between 2012 and 2013 to 167,000 worldwide.

The report also found that the super-rich have increased by 59 percent over the past decade, with the number of billionaires counted in dollars increasing by 80 percent to 1,682 individuals worldwide.