-90.45% is the change from 691 to 66
Calculation steps:
[( 66 - 691 ) ÷ 691] x 100 = -90.45%
Formula
Percentage change = [(66 - 691) / 691] x 100
Subtract the new number by the original number
66 - 691 = -625
-625 ÷ 691 = -0.9044862518089725
-0.9044862518089725 x 100 = -90.45%