Vincent Van Gogh sold only one painting during his lifetime, for about $30. In 1987, a sunflower still life he painted in 1888 sold for $39.85 million, more than three times the highest price paid previously for any work of art. Observers attributed the record price in part to the fact that his other sunflower paintings are all in museums and most likely will never be available for sale. If this painting had been purchased for $30 in 1888 and sold in 1987 for $39.85 million, what would have been the annual rate of return?