-89.95% is the change from 657 to 66
Calculation steps:
[( 66 - 657 ) ÷ 657] x 100 = -89.95%
Formula
Percentage change = [(66 - 657) / 657] x 100
Subtract the new number by the original number
66 - 657 = -591
-591 ÷ 657 = -0.8995433789954338
-0.8995433789954338 x 100 = -89.95%