Question: What was the difference in home team and away team win percentages across all divisions in 2010?
SQL: SELECT CAST(COUNT(CASE WHEN FTR = 'H' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(FTR) - CAST(COUNT(CASE WHEN FTR = 'A' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(FTR) DIFFERENCE FROM matchs WHERE season = 2010