Social Security Projections

A more sophisticated model that has Social Security broken out should use these numbers for projections:
2012 760
2013 802
2014 849
2015 899
2016 952
2017 1010
2018 1073
2019 1146
2020 1226

From:  http://www.ssa.gov/oact/tr/2011/tr2011.pdf, pg 50, Intermediate Projection.

After 2020, the projected expenditures are given as a percent of GDP as follows.
2020 7.02%
2025 7.66%
2030 8.15%
2035 8.40%
2040 8.43%
2045 8.36%
2050 8.28%