On day $1,$ the stock price of Ford was $$81$ and the automotive stock index was $324.$ On day $2,$ the stock price of Ford was $$85$ and the automotive stock index was $335.$ Consider the relative strength ratio of Ford to the automotive stock index at day $1$ and day $2.$ What is the percentage change in Ford$$s relative strength ratio? Do not enter $\%$ in the answer box. For example, if your answer is $0\mathrm{.}12345$ or $12\mathrm{.}345\%$ then enter as $12\mathrm{.}35$ in the answer box.