$ 21 billion

The Haitian president asked the French government to repay the money France had extorted from Haiti in the nineteenth century, and was only too happy to let them know how much 150 million germinal francs were worth in 2003: with interest, $ 21 billion (p. 131 d.e.).

That is Paul Farmer in this book. A book review is here. My book review: "Wowww! How can this be possible!"