The history of the various proposals for funding this agency has been described in detail in the 1993 report of the National Commission on Social Security Reform, "Strengthening Social Security: A Proposal for Modernizing the Social Security System," and in the 1993 report of the National Commission on Economic Growth and Tax Reform, "Strengthening Social Security: A Proposal for Modernizing the Social Security System."
The report had a lot of prior reports helping back its information, moreso than it could provide data on its own.