-95% is the change from 680 to 34
Calculation steps:
[( 34 - 680 ) ÷ 680] x 100 = -95%
Formula
Percentage change = [(34 - 680) / 680] x 100
Subtract the new number by the original number
34 - 680 = -646
-646 ÷ 680 = -0.95
-0.95 x 100 = -95%
Example