CREATE TABLE table_30314 ("Year Location" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

How many years did lin gaoyuan wu jiaji play mens doubles?
SELECT COUNT("Year Location") FROM table_30314 WHERE "Mens Doubles" = 'Lin Gaoyuan Wu Jiaji'
SELECT COUNT("Year Location") FROM "table_30314" WHERE "Mens Doubles" = 'Lin Gaoyuan Wu Jiaji'