CREATE TABLE table_17517 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

How many mens doubles when womens doubles is catrine bengtsson margit borg?
SELECT COUNT("Mens doubles") FROM table_17517 WHERE "Womens doubles" = 'Catrine Bengtsson Margit Borg'
SELECT COUNT("Mens doubles") FROM "table_17517" WHERE "Womens doubles" = 'Catrine Bengtsson Margit Borg'