A painting was bought for 3.52 million in 1989 and sold for 1.95 million in 1995. What is the return? Thank you for any help

The annual return is given by...

\left(\frac{S}{P}\right)^{1/n} - 1

... where S, P, and n denote the sales proceeds, the original purchase amount, and the number of years the asset was held.

Obviously in this case the return was < 0. To twist an old expression, I don't know art, but I know what a negative return looks like ;)