Calculate the percentage of the weight of goods being transported by Zachery Hicks to California in year 2016.
"California" is the state; in 2016 refers to CAST (ship_date AS DATE) = 2016; percentage = Divide (Sum(weight where first_name = 'Zachery' AND last_name = 'Hicks'), Sum(weight)) * 100
SELECT CAST(SUM(CASE WHEN T2.first_name = 'Zachery' AND T2.last_name = 'Hicks' THEN T1.weight ELSE 0 END) AS REAL) * 100 / SUM(T1.weight) FROM shipment AS T1 INNER JOIN driver AS T2 ON T1.driver_id = T2.driver_id WHERE STRFTIME('%Y', T1.ship_date) = '2016'