CREATE TABLE table_49288 ("Winner" TEXT, "Country" TEXT, "Winter Olympics" FLOAT, "FIS Nordic World Ski Championships" FLOAT, "Holmenkollen" TEXT)

What is the FIS Nordic World Ski Championship years when the winter Olympics took place in 1968?
SELECT "FIS Nordic World Ski Championships" FROM table_49288 WHERE "Winter Olympics" = '1968'
SELECT "FIS Nordic World Ski Championships" FROM "table_49288" WHERE "Winter Olympics" = '1968'