The manner in which answer grade fractions are represented in the question back Moodle XML import format is inconsistent. Most questions use a percentage (0-100), but some (numerical and essay) use a fraction 0-1.
Make all questions use the 0-100 format. The change must be backward compatible so that 0-1 data is handled appropriately.
Discussion: http://moodle.org/mod/forum/discuss.php?d=66532