This exceptional group of billionaires has not only been
able to remain in this elite class, they have grown their
average wealth by a factor of 3.8 in the last two decades,
boosting their average wealth from US$ 2.9 billion to
US$ 11 billion in 2014. Since 1995, they have created a
total of US$1 trillion of wealth, approximately 21% of
that produced by our entire global billionaire population.