Mob's Armor Durability Loss

Mob's armor is now losing durability, depending of the damage.
they cant lose durability by potion damage, fall damage, wither, fire or lava,
heres info how many damage = durability loss:

0.01 - 1 = 0 dur. loss
1.01 - 3.50 = 5 dur. loss
3.51 - 9.99 = 10 dur. loss
10+ = 20 dur. loss