-98.57% is the change from 70 to 1
Calculation steps:
[( 1 - 70 ) ÷ 70] x 100 = -98.57%
Formula
Percentage change = [(1 - 70) / 70] x 100
Subtract the new number by the original number
1 - 70 = -69
-69 ÷ 70 = -0.9857142857142858
-0.9857142857142858 x 100 = -98.57%