Table: united states house of representatives elections , 2012
Question: What is the percentage difference between the winning candidate and the losing candidate in the districts where the incumbent lost re-election in 2012?
Step 1 (Reasoning, Other Commonsense Reasoning): incumbent lost re-election
Step 2 (Operation, Grouping): result
Step 3 (Operation, Indexing): candidates
Step 4 (Reasoning, Arithmetic): -, vote percentage
Answer: 8.2