CREATE TABLE table_5348 ("Year" TEXT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

In what year did Yvette Porteous play women's singles?
SELECT "Year" FROM table_5348 WHERE "Women's singles" = 'yvette porteous'
SELECT "Year" FROM "table_5348" WHERE "Women's singles" = 'yvette porteous'