Pew Charitable Trusts [to 18 July 2015]
http://www.pewtrusts.org/en/about/news-room/press-releases

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Pew Analysis Shows $968 Billion State Public Pension Funding Gap in FY 2013
July 14, 2015 Press Release Public Sector Retirement Systems
State-run retirement systems faced a $968 billion shortfall in 2013 between pension benefits promised to government workers and the funding needed to meet those obligations, a $54 billion increase from the previous year, according to a brief released today by The Pew Charitable Trusts…