CREATE TABLE table_68131 ("Player" TEXT, "Height" FLOAT, "Position" TEXT, "Year born" FLOAT, "Current Club" TEXT)

When was radek necas with less than 2.04 height born?
SELECT AVG("Year born") FROM table_68131 WHERE "Player" = 'radek necas' AND "Height" < '2.04'
SELECT AVG("Year born") FROM "table_68131" WHERE "Height" < '2.04' AND "Player" = 'radek necas'