The following are percent averages over a long period of time (out of a possible 16) you get:

1 normal = ⁺⁺⁺⁺
1 snow = aabb
1 albino = aa⁺⁺
1 axanthic = bb⁺⁺
2 heterozygous axanthic = b⁺⁺⁺
2 heterozygous albino = a⁺⁺⁺
4 double heterozygous for snow = a⁺b⁺
2 axanthic heterozygous for albino = a⁺bb
2 albino heterozygous for axanthic = aab⁺