On May 22, 2010, a Florida man Laszlo Hanyecz, now known as Bitcoin Pizza Guy, offered to pay 10,000 Bitcoins to anyone who can arrange for food delivered to him in a group chat on an internet forum. A British man took the offer and paid $25 for a box of Papa Johns pizzas delivered to Hanyecz in exchange of the 10,000 Bitcoins. On May 22, 2022, a single Bitcoins market value was around $30,260.80. If the British guy held on to his 10,000 Bitcoins from 2010 to 2022, what has been his annual return (in %) over the 12-year period?