CREATE TABLE table_30320 ("Year Location" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

How many times was the womens doubles in china?
SELECT COUNT("Mens Singles") FROM table_30320 WHERE "Womens Doubles" = 'China'
SELECT COUNT("Mens Singles") FROM "table_30320" WHERE "Womens Doubles" = 'China'