Assign automatic weightage for set of negative numbers

Question

I have set of negative numbers

e.g. [-0.189, -3.55, -19.90, -0.0001]

now I have to convert this set to percentage such that largest number will have highest percentage.

e.g. in above example, -0.0001 should have highest percentage compare to -19.90

Currently I do following,

1. Convert every number to positive by taking absolute value
2. Convert positive number to their respective percentage (x*100/sum)
3. 100-above percentage
4. Convert again this to percentage (x'*100/sum)

However this approach is not keeping relative weight age of original numbers. Any ideas? I checked this similar question but I am dealing with negative numbers so can't really use that formula.