Question: Among all shipments placed by Sunguard Window Tinting & Truck Accessories in 2017, identify the percentage of shipments whose weight exceeded 10,000 pounds.
SQL: SELECT CAST(SUM(CASE WHEN T1.weight >= 10000 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(*) FROM shipment AS T1 INNER JOIN customer AS T2 ON T1.cust_id = T2.cust_id WHERE T2.cust_name = 'Sunguard Window Tinting & Truck Accessories' AND STRFTIME('%Y', T1.ship_date) = '2017'