-87.8% is the change from 164 to 20
Calculation steps:
[( 20 - 164 ) ÷ 164] x 100 = -87.8%
Formula
Percentage change = [(20 - 164) / 164] x 100
Subtract the new number by the original number
20 - 164 = -144
-144 ÷ 164 = -0.8780487804878049
-0.8780487804878049 x 100 = -87.8%