CREATE TABLE table_23682 ("Year" FLOAT, "Mens singles" CLOB, "Womens singles" CLOB, "Mens doubles" CLOB, "Womens doubles" CLOB, "Mixed doubles" CLOB)

state the earliest year li xuerui won womens singles
SELECT MIN("Year") FROM table_23682 WHERE "Womens singles" = 'Li Xuerui'
SELECT MIN("Year") FROM "table_23682" WHERE "Womens singles" = 'Li Xuerui'