-81.6% is the change from 163 to 30
Calculation steps:
[( 30 - 163 ) ÷ 163] x 100 = -81.6%
Formula
Percentage change = [(30 - 163) / 163] x 100
Subtract the new number by the original number
30 - 163 = -133
-133 ÷ 163 = -0.8159509202453987
-0.8159509202453987 x 100 = -81.6%