According to my tsp.gov online account, my 'Personal Rate of Return' for the twelve months ending November 30, 2015, was up 4.85%.
Personal Rate of Return
2009 +29.86%
2010 +13.31%
2011 - 0.74%
2012 +11.42%
2013 +14.45%
2014 +3.66%
January 31, 2015 +5.49%
February 28, 2015 +7.68%
March 31, 2015 +7.13%
April 30, 2015 +7.80%
May 31, 2015 +6.85%
June 30, 2015 +3.87%
July 31, 2015 +6.38%
August 31, 2015 +3.61%
September 30, 2015 +2.23%
October 31, 2015 + 6.03%
November 30, 2015 +4.85%
AUTOTRACKER FOR 2012: +11.97%
AUTOTRACKER FOR 2013: +14.59%
AUTOTRACKER FOR 2014: +3.52%