CREATE TABLE table_68943 ("Year" TEXT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

what year saw georgy trouerbach nicole van hooren win the women's doubles?
SELECT "Year" FROM table_68943 WHERE "Women's doubles" = 'georgy trouerbach nicole van hooren'
SELECT "Year" FROM "table_68943" WHERE "Women's doubles" = 'georgy trouerbach nicole van hooren'