-12.86% is the change from 70 to 61
Calculation steps:
[( 61 - 70 ) ÷ 70] x 100 = -12.86%
Formula
Percentage change = [(61 - 70) / 70] x 100
Subtract the new number by the original number
61 - 70 = -9
-9 ÷ 70 = -0.12857142857142856
-0.12857142857142856 x 100 = -12.86%