What is the average atomic mass for neon?

Neon-20 has a mass of 19.9924 amu
Neon-21 has a mass of 20.9940 amu
Neon-22 has a mass of 21.9914 amu

The relative abundance of 20Ne is 90.92% and 21 Ne is .257% and 22 Ne is 8.82%.