CREATE TABLE table_9581 ("Year" FLOAT, "Lijsttrekker" TEXT, "Fractievoorzitter" TEXT, "Cabinet" TEXT, "Chair" TEXT)

What is Lijsttrekker, when Year is after 1990, and when Chair is 'Ingrid Van Engelshoven'?
SELECT "Lijsttrekker" FROM table_9581 WHERE "Year" > '1990' AND "Chair" = 'ingrid van engelshoven'
SELECT "Lijsttrekker" FROM "table_9581" WHERE "Chair" = 'ingrid van engelshoven' AND "Year" > '1990'