-86.15% is the change from 657 to 91
Calculation steps:
[( 91 - 657 ) ÷ 657] x 100 = -86.15%
Formula
Percentage change = [(91 - 657) / 657] x 100
Subtract the new number by the original number
91 - 657 = -566
-566 ÷ 657 = -0.8614916286149162
-0.8614916286149162 x 100 = -86.15%