CREATE TABLE table_54675 ("Year" FLOAT, "Pick" TEXT, "Player name" TEXT, "Position" TEXT, "College" TEXT)

Tell me the year for defensive tackle and college of lsu
SELECT "Year" FROM table_54675 WHERE "Position" = 'defensive tackle' AND "College" = 'lsu'
SELECT "Year" FROM "table_54675" WHERE "College" = 'lsu' AND "Position" = 'defensive tackle'