CREATE TABLE table_17385 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

How many womens singles winners were there when peter rasmussen won the mens singles?
SELECT COUNT("Womens singles") FROM table_17385 WHERE "Mens singles" = 'Peter Rasmussen'
SELECT COUNT("Womens singles") FROM "table_17385" WHERE "Mens singles" = 'Peter Rasmussen'