Given this paragraph about stainless steel, which of the two series contains the most nickel content?

There are two subgroups of austenitic stainless steel. 300 series stainless steels achieve their austenitic structure primarily by a nickel addition while 200 series stainless steels substitute manganese and nitrogen for nickel, though there is still a small nickel content.

The 300 series contains the most nickel content.