-84.98% is the change from 659 to 99
Calculation steps:
[( 99 - 659 ) ÷ 659] x 100 = -84.98%
Formula
Percentage change = [(99 - 659) / 659] x 100
Subtract the new number by the original number
99 - 659 = -560
-560 ÷ 659 = -0.849772382397572
-0.849772382397572 x 100 = -84.98%