-5.71% is the change from 70 to 66
Calculation steps:
[( 66 - 70 ) ÷ 70] x 100 = -5.71%
Formula
Percentage change = [(66 - 70) / 70] x 100
Subtract the new number by the original number
66 - 70 = -4
-4 ÷ 70 = -0.05714285714285714
-0.05714285714285714 x 100 = -5.71%