Question: What is the percentage of the payment amount in 2004 was made by Atelier graphique?
SQL: SELECT SUM(CASE WHEN t1.customerName = 'Atelier graphique' THEN t2.amount ELSE 0 END) * 100 / SUM(t2.amount) FROM customers AS t1 INNER JOIN payments AS t2 ON t1.customerNumber = t2.customerNumber WHERE STRFTIME('%Y', t2.paymentDate) = '2004'