CREATE TABLE table_79824 ("Nat." TEXT, "Name" TEXT, "Since" TEXT, "Goals" FLOAT, "Transfer fee" TEXT)

What the since year of the player with a transfer fee of 75k?
SELECT "Since" FROM table_79824 WHERE "Transfer fee" = '£ 75k'
SELECT "Since" FROM "table_79824" WHERE "Transfer fee" = '£ 75k'