-87.54% is the change from 690 to 86
Calculation steps:
[( 86 - 690 ) ÷ 690] x 100 = -87.54%
Formula
Percentage change = [(86 - 690) / 690] x 100
Subtract the new number by the original number
86 - 690 = -604
-604 ÷ 690 = -0.8753623188405797
-0.8753623188405797 x 100 = -87.54%