-85.07% is the change from 201 to 30
Calculation steps:
[( 30 - 201 ) ÷ 201] x 100 = -85.07%
Formula
Percentage change = [(30 - 201) / 201] x 100
Subtract the new number by the original number
30 - 201 = -171
-171 ÷ 201 = -0.8507462686567164
-0.8507462686567164 x 100 = -85.07%