-94.93% is the change from 670 to 34
Calculation steps:
[( 34 - 670 ) ÷ 670] x 100 = -94.93%
Formula
Percentage change = [(34 - 670) / 670] x 100
Subtract the new number by the original number
34 - 670 = -636
-636 ÷ 670 = -0.9492537313432836
-0.9492537313432836 x 100 = -94.93%