In 2016, which city has the highest number of establishments with the highest health and safety hazards?
the highest health and safety hazards refer to risk_category = 'High Risk'; year(date) = 2016; establishments has the same meaning as businesses;
SELECT T2.city FROM violations AS T1 INNER JOIN businesses AS T2 ON T1.business_id = T2.business_id WHERE STRFTIME('%Y', T1.`date`) = '2016' AND T1.risk_category = 'High Risk' GROUP BY T2.city ORDER BY COUNT(T2.city) DESC LIMIT 1