Alberta Heritage and Trust Fund Robbed!

Iris Evans tells us the Heritage Trust has grown at a regular 4% rate which is good.

The Heritage Savings and Trust fund was initiated with a 3 billion dollar deposit.
Over the past 35 years, a 1 billion dollar additional deposit would be a close estimate.
If that account appreciated at 4% compounded quarterly as Iris Evans says, the account would now be at $87,758,778,068.54

87 billion dollars should be in there, Iris tells us there is only 16 billion. Where did the other 70 billion dollars go to??