Input (grade 9): They are the most common variety forming around 75% of known asteroids, and an even higher percentage in the outer part of the belt beyond 2.7 AU, which is dominated by this asteroid type.
Output (grade 9): They are the most common variety taking up around 75% of known asteroids, and an even higher percentage in the farther part of the belt beyond 2.7 AU, which is dominated by this asteroid type.