I don't know what I want to do after university http://keandra.in.net keandra.com The trusts returned about 14 percent a year before taxes during that period, according to a Bloomberg analysis of IRS filings. That growth means the four Helen Walton trusts have been accumulating assets faster than they give them away. As of 2011, they held a combined $2 billion, up from $1.4 billion in 2007.