In a high-temperature gas-cooled nuclear reactor (HTGR) using helium coolant and graphite blocks as a moderator:

• the average speed of the fast fission neutrons upon release is 1.8 × 10⁷ m s^-1
• the average speed of the moderated thermal neutrons is 3.1 × 10³ m s^-1

Calculate the average speed of the moderated thermal neutrons as a percentage of the average speed of the fast fission neutrons.

Give your answer to 2 significant figures.