SELECT *, 100 * dwindle / total AS percentage
	FROM (
		SELECT  buyer,
				sum(saleTotal) as total,
				sum(saleWaste) as dwindle
			FROM bs.waste w
		        JOIN vn.time t ON w.year = t.year AND w.week = t.week
		    WHERE t.dated = DATE_ADD(CURDATE(), INTERVAL -1 WEEK)
			GROUP BY buyer
		) sub
		ORDER BY percentage DESC;