-87.14% is the change from 70 to 9
Calculation steps:
[( 9 - 70 ) ÷ 70] x 100 = -87.14%
Formula
Percentage change = [(9 - 70) / 70] x 100
Subtract the new number by the original number
9 - 70 = -61
-61 ÷ 70 = -0.8714285714285714
-0.8714285714285714 x 100 = -87.14%