The civilian non-institutionalized population increased from 240,584,000 to to 242,269,000, a increase of 1,685,000, and more importantly the actual civilian employment dropped from 140,681,000 in December 2011, to 139,944,000 in January 2012.
Using the BLS data the employment was 139,994,000 and the civilian labor force was 153,485,000 for a unemployment rate of 8.8%. So there is a statistical correction with their numbers of 0.5%?
If you use the late 90s as a base line the unemployment rate is 139,994,000/164,112,000 = 14.7%. The 164,112,000 is based on a growth rate of 16.68% in the civilian non-institutional population increase since June 1999.
If you use more recent participation rate the unemployment rate INCREASED to 11.5%.
Either way you calculate it the federal government has decided they do not want Mitt Romney cutting their budgets and the propaganda war is on. Look for this bogus data to continue through election day.