31=Disappear
32=Rank 1
33=Rank 2
34=Rank 3
35=Rank 4
36=Rank 5
37=Rank 6
38=Rank 7
39=Rank 8
3A=Rank 9
3B=Rank 10
3C=Rank 11
3D=Rank 12
3E=Rank 13
3F=Rank 14
ETC.
45=Max

45 Isn't Rank 50 icon though!