13. Actuarial Liabilities
The following Mathematical Provisions were determined based on actuarial calculations made by licensed Social Security Department professionals, as per the opinion of 02/05/2009.
The R$4,331,209,000 variation derived from the biometric actuarial premises used in the actuarial reappraisal of December 2008 for 2009, as approved by the Executive Board and by the Deliberative Body.
In July/2007, PREVI implemented the AT-83 Mortality Table for the actuarial appraisal of the Benefit Plan 1, while for the PREVI Futuro Plan the Table was implemented in October/2007.