95 - 100  A+    4   IIII
 90 - 95   A     9    V   IIII
 85 - 90   A-   12    V    V    II
 80 - 85   B+   21    V    V    V    V    I
 75 - 80   B    24    V    V    V    V   IIII
 70 - 75   B-   34    V    V    V    V    V    V   IIII
 65 - 70   C+   24    V    V    V    V   IIII
 60 - 65   C    29    V    V    V    V    V   IIII
 55 - 60   C-   12    V    V    II
 50 - 55   D+    7    V    II
 45 - 50   D     5    V
 40 - 45   D-    1    I
    < 45   F     2    II