By 1995, a billion cubic metres of the gas had been collected, and the reserve was US$1.4 billion in debt, prompting Congress to begin phasing out the reserve in 1996.[5][6] The resulting Helium Privatization Act of 1996 (Public Law 104–273) directed the Department of the Interior to start selling off the reserve by 2005.[7]
* assuming you can trust it ...
For those interested in more detail, Texas Monthly has a (characteristically) excellent article that goes into much more detail than the Wikipedia entry:
https://www.texasmonthly.com/news-politics/amarillo-federal-helium-reserve-auction/