When selected, the icon to the left of a Mapping Expression will pop-out Documentation to help correctly format Mapping Expressions where required.
Pay attention to the preview data; in particular accuracy percentages.
Percentages are commonly presented as decimals, however this file has them presented as the actual percentage number, so this is affecting import value.
Using basic arithmetic, you are able to adjust the import value to a more sensical value. /100 = divide by 100, moving the decimal of the import value, 2 spots to the left.