Spain\'s public debt will rise to 79.8 percent of gross domestic product at the end of 2012 from 68.5 percent at the end of last year, the finance ministry said Tuesday. \"Public debt will rise from 68.5 percent of GDP at the end of 2011 to 79.8 percent, a level which is still below the eurozone average of 90.4 percent,\" it said in a statement as Budget Minister Cristobal Montoro presented his government\'s 2012 budget to lawmakers.