-95.49% is the change from 665 to 30
Calculation steps:
[( 30 - 665 ) ÷ 665] x 100 = -95.49%
Formula
Percentage change = [(30 - 665) / 665] x 100
Subtract the new number by the original number
30 - 665 = -635
-635 ÷ 665 = -0.9548872180451128
-0.9548872180451128 x 100 = -95.49%